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Finding the Fourth Proportional to 399,980.09, 551,981.17 and 238,805.07

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Solution

The fourth proportional to 399,980.09, 551,981.17 and 238,805.07 is: 329,556.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,980.09 : 551,981.17 = 238,805.07 : x
  2. Step 2: Convert to fraction form
    399,980.09/551,981.17 = 238,805.07/x
  3. Step 3: Cross multiply
    399,980.09x = 551,981.17 × 238,805.07
  4. Step 4: Simplify right side
    399,980.09x = 131,815,901,940.53
  5. Step 5: Solve for x
    x = 131,815,901,940.53/399,980.09
  6. Step 6: Final answer
    x = 329,556.16

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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.