Home / 129,589.43-178,893.45-91,380.11

Finding the Fourth Proportional to 129,589.43, 178,893.45 and 91,380.11

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Solution

The fourth proportional to 129,589.43, 178,893.45 and 91,380.11 is: 126,146.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,589.43 : 178,893.45 = 91,380.11 : x
  2. Step 2: Convert to fraction form
    129,589.43/178,893.45 = 91,380.11/x
  3. Step 3: Cross multiply
    129,589.43x = 178,893.45 × 91,380.11
  4. Step 4: Simplify right side
    129,589.43x = 16,347,303,139.28
  5. Step 5: Solve for x
    x = 16,347,303,139.28/129,589.43
  6. Step 6: Final answer
    x = 126,146.89

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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.