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Finding the Fourth Proportional to 91,385.76, 136,699.44 and 85,787.04

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Solution

The fourth proportional to 91,385.76, 136,699.44 and 85,787.04 is: 128,324.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,385.76 : 136,699.44 = 85,787.04 : x
  2. Step 2: Convert to fraction form
    91,385.76/136,699.44 = 85,787.04/x
  3. Step 3: Cross multiply
    91,385.76x = 136,699.44 × 85,787.04
  4. Step 4: Simplify right side
    91,385.76x = 11,727,040,327.26
  5. Step 5: Solve for x
    x = 11,727,040,327.26/91,385.76
  6. Step 6: Final answer
    x = 128,324.59

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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.