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Finding the Fourth Proportional to 112.52, 155.18 and 87.63

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Solution

The fourth proportional to 112.52, 155.18 and 87.63 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.52 : 155.18 = 87.63 : x
  2. Step 2: Convert to fraction form
    112.52/155.18 = 87.63/x
  3. Step 3: Cross multiply
    112.52x = 155.18 × 87.63
  4. Step 4: Simplify right side
    112.52x = 13,597.99
  5. Step 5: Solve for x
    x = 13,597.99/112.52
  6. Step 6: Final answer
    x = 120.85

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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.