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Finding the Fourth Proportional to 85,610.88, 128,242.24 and 69,872

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Solution

The fourth proportional to 85,610.88, 128,242.24 and 69,872 is: 104,665.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,610.88 : 128,242.24 = 69,872 : x
  2. Step 2: Convert to fraction form
    85,610.88/128,242.24 = 69,872/x
  3. Step 3: Cross multiply
    85,610.88x = 128,242.24 × 69,872
  4. Step 4: Simplify right side
    85,610.88x = 8,960,541,793.28
  5. Step 5: Solve for x
    x = 8,960,541,793.28/85,610.88
  6. Step 6: Final answer
    x = 104,665.92

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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.