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Finding the Fourth Proportional to 712,521.92, 983,253.78 and 390,234.66

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Solution

The fourth proportional to 712,521.92, 983,253.78 and 390,234.66 is: 538,509.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,521.92 : 983,253.78 = 390,234.66 : x
  2. Step 2: Convert to fraction form
    712,521.92/983,253.78 = 390,234.66/x
  3. Step 3: Cross multiply
    712,521.92x = 983,253.78 × 390,234.66
  4. Step 4: Simplify right side
    712,521.92x = 383,699,704,532.02
  5. Step 5: Solve for x
    x = 383,699,704,532.02/712,521.92
  6. Step 6: Final answer
    x = 538,509.34

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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.