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Finding the Fourth Proportional to 696,686.76, 961,415.28 and 390,763.80

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Solution

The fourth proportional to 696,686.76, 961,415.28 and 390,763.80 is: 539,247.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,686.76 : 961,415.28 = 390,763.80 : x
  2. Step 2: Convert to fraction form
    696,686.76/961,415.28 = 390,763.80/x
  3. Step 3: Cross multiply
    696,686.76x = 961,415.28 × 390,763.80
  4. Step 4: Simplify right side
    696,686.76x = 375,686,288,190.86
  5. Step 5: Solve for x
    x = 375,686,288,190.86/696,686.76
  6. Step 6: Final answer
    x = 539,247.06

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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.