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Finding the Fourth Proportional to 231,637.40, 319,644.79 and 129,645.71

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Solution

The fourth proportional to 231,637.40, 319,644.79 and 129,645.71 is: 178,902.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,637.40 : 319,644.79 = 129,645.71 : x
  2. Step 2: Convert to fraction form
    231,637.40/319,644.79 = 129,645.71/x
  3. Step 3: Cross multiply
    231,637.40x = 319,644.79 × 129,645.71
  4. Step 4: Simplify right side
    231,637.40x = 41,440,575,747.35
  5. Step 5: Solve for x
    x = 41,440,575,747.35/231,637.40
  6. Step 6: Final answer
    x = 178,902.78

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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.