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Finding the Fourth Proportional to 717,739.86, 990,471.86 and 391,066.47

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Solution

The fourth proportional to 717,739.86, 990,471.86 and 391,066.47 is: 539,666.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,739.86 : 990,471.86 = 391,066.47 : x
  2. Step 2: Convert to fraction form
    717,739.86/990,471.86 = 391,066.47/x
  3. Step 3: Cross multiply
    717,739.86x = 990,471.86 × 391,066.47
  4. Step 4: Simplify right side
    717,739.86x = 387,340,338,616.47
  5. Step 5: Solve for x
    x = 387,340,338,616.47/717,739.86
  6. Step 6: Final answer
    x = 539,666.75

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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.