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Finding the Fourth Proportional to 231,361.78, 319,277.46 and 129,387.40

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Solution

The fourth proportional to 231,361.78, 319,277.46 and 129,387.40 is: 178,553.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,361.78 : 319,277.46 = 129,387.40 : x
  2. Step 2: Convert to fraction form
    231,361.78/319,277.46 = 129,387.40/x
  3. Step 3: Cross multiply
    231,361.78x = 319,277.46 × 129,387.40
  4. Step 4: Simplify right side
    231,361.78x = 41,310,480,428.00
  5. Step 5: Solve for x
    x = 41,310,480,428.00/231,361.78
  6. Step 6: Final answer
    x = 178,553.61

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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.