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Finding the Fourth Proportional to 399,920.90, 551,897.42 and 238,790.03

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Solution

The fourth proportional to 399,920.90, 551,897.42 and 238,790.03 is: 329,534.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,920.90 : 551,897.42 = 238,790.03 : x
  2. Step 2: Convert to fraction form
    399,920.90/551,897.42 = 238,790.03/x
  3. Step 3: Cross multiply
    399,920.90x = 551,897.42 × 238,790.03
  4. Step 4: Simplify right side
    399,920.90x = 131,787,597,525.29
  5. Step 5: Solve for x
    x = 131,787,597,525.29/399,920.90
  6. Step 6: Final answer
    x = 329,534.16

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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.