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Finding the Fourth Proportional to 231,387.72, 319,314.13 and 129,412.77

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Solution

The fourth proportional to 231,387.72, 319,314.13 and 129,412.77 is: 178,589.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,387.72 : 319,314.13 = 129,412.77 : x
  2. Step 2: Convert to fraction form
    231,387.72/319,314.13 = 129,412.77/x
  3. Step 3: Cross multiply
    231,387.72x = 319,314.13 × 129,412.77
  4. Step 4: Simplify right side
    231,387.72x = 41,323,326,063.44
  5. Step 5: Solve for x
    x = 41,323,326,063.44/231,387.72
  6. Step 6: Final answer
    x = 178,589.11

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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.