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Finding the Fourth Proportional to 717,759.76, 990,509.43 and 391,071.10

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Solution

The fourth proportional to 717,759.76, 990,509.43 and 391,071.10 is: 539,678.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,759.76 : 990,509.43 = 391,071.10 : x
  2. Step 2: Convert to fraction form
    717,759.76/990,509.43 = 391,071.10/x
  3. Step 3: Cross multiply
    717,759.76x = 990,509.43 × 391,071.10
  4. Step 4: Simplify right side
    717,759.76x = 387,359,612,350.47
  5. Step 5: Solve for x
    x = 387,359,612,350.47/717,759.76
  6. Step 6: Final answer
    x = 539,678.64

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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.