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Finding the Fourth Proportional to 663,786.20, 915,788.76 and 391,717.96

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Solution

The fourth proportional to 663,786.20, 915,788.76 and 391,717.96 is: 540,431.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,786.20 : 915,788.76 = 391,717.96 : x
  2. Step 2: Convert to fraction form
    663,786.20/915,788.76 = 391,717.96/x
  3. Step 3: Cross multiply
    663,786.20x = 915,788.76 × 391,717.96
  4. Step 4: Simplify right side
    663,786.20x = 358,730,904,858.13
  5. Step 5: Solve for x
    x = 358,730,904,858.13/663,786.20
  6. Step 6: Final answer
    x = 540,431.40

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Double scale
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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.