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Finding the Fourth Proportional to 696,684.78, 961,348.10 and 390,698.18

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Solution

The fourth proportional to 696,684.78, 961,348.10 and 390,698.18 is: 539,120.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,684.78 : 961,348.10 = 390,698.18 : x
  2. Step 2: Convert to fraction form
    696,684.78/961,348.10 = 390,698.18/x
  3. Step 3: Cross multiply
    696,684.78x = 961,348.10 × 390,698.18
  4. Step 4: Simplify right side
    696,684.78x = 375,596,953,016.46
  5. Step 5: Solve for x
    x = 375,596,953,016.46/696,684.78
  6. Step 6: Final answer
    x = 539,120.37

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.