Home / 87,402.75-121,072.60-85,631.28

Finding the Fourth Proportional to 87,402.75, 121,072.60 and 85,631.28

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Solution

The fourth proportional to 87,402.75, 121,072.60 and 85,631.28 is: 118,618.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,402.75 : 121,072.60 = 85,631.28 : x
  2. Step 2: Convert to fraction form
    87,402.75/121,072.60 = 85,631.28/x
  3. Step 3: Cross multiply
    87,402.75x = 121,072.60 × 85,631.28
  4. Step 4: Simplify right side
    87,402.75x = 10,367,601,710.93
  5. Step 5: Solve for x
    x = 10,367,601,710.93/87,402.75
  6. Step 6: Final answer
    x = 118,618.71

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.