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Finding the Fourth Proportional to 85,769.60, 128,602.29 and 38,375.85

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Solution

The fourth proportional to 85,769.60, 128,602.29 and 38,375.85 is: 57,540.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,769.60 : 128,602.29 = 38,375.85 : x
  2. Step 2: Convert to fraction form
    85,769.60/128,602.29 = 38,375.85/x
  3. Step 3: Cross multiply
    85,769.60x = 128,602.29 × 38,375.85
  4. Step 4: Simplify right side
    85,769.60x = 4,935,222,816.86
  5. Step 5: Solve for x
    x = 4,935,222,816.86/85,769.60
  6. Step 6: Final answer
    x = 57,540.47

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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.