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Finding the Fourth Proportional to 717,690.92, 990,458.10 and 395,400.94

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Solution

The fourth proportional to 717,690.92, 990,458.10 and 395,400.94 is: 545,677.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,690.92 : 990,458.10 = 395,400.94 : x
  2. Step 2: Convert to fraction form
    717,690.92/990,458.10 = 395,400.94/x
  3. Step 3: Cross multiply
    717,690.92x = 990,458.10 × 395,400.94
  4. Step 4: Simplify right side
    717,690.92x = 391,628,061,294.47
  5. Step 5: Solve for x
    x = 391,628,061,294.47/717,690.92
  6. Step 6: Final answer
    x = 545,677.88

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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.