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Finding the Fourth Proportional to 134,013.60, 200,728.80 and 81,331.20

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Solution

The fourth proportional to 134,013.60, 200,728.80 and 81,331.20 is: 121,819.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    134,013.60 : 200,728.80 = 81,331.20 : x
  2. Step 2: Convert to fraction form
    134,013.60/200,728.80 = 81,331.20/x
  3. Step 3: Cross multiply
    134,013.60x = 200,728.80 × 81,331.20
  4. Step 4: Simplify right side
    134,013.60x = 16,325,514,178.56
  5. Step 5: Solve for x
    x = 16,325,514,178.56/134,013.60
  6. Step 6: Final answer
    x = 121,819.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.