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Finding the Fourth Proportional to 717,650, 990,357 and 399,698

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Solution

The fourth proportional to 717,650, 990,357 and 399,698 is: 551,583.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,650 : 990,357 = 399,698 : x
  2. Step 2: Convert to fraction form
    717,650/990,357 = 399,698/x
  3. Step 3: Cross multiply
    717,650x = 990,357 × 399,698
  4. Step 4: Simplify right side
    717,650x = 395,843,712,186
  5. Step 5: Solve for x
    x = 395,843,712,186/717,650
  6. Step 6: Final answer
    x = 551,583.24

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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.