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Finding the Fourth Proportional to 112,691.88, 155,349.12 and 85,787.52

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Solution

The fourth proportional to 112,691.88, 155,349.12 and 85,787.52 is: 118,260.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,691.88 : 155,349.12 = 85,787.52 : x
  2. Step 2: Convert to fraction form
    112,691.88/155,349.12 = 85,787.52/x
  3. Step 3: Cross multiply
    112,691.88x = 155,349.12 × 85,787.52
  4. Step 4: Simplify right side
    112,691.88x = 13,327,015,738.98
  5. Step 5: Solve for x
    x = 13,327,015,738.98/112,691.88
  6. Step 6: Final answer
    x = 118,260.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.