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Finding the Fourth Proportional to 112.53, 155.28 and 77.58

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Solution

The fourth proportional to 112.53, 155.28 and 77.58 is: 107.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.53 : 155.28 = 77.58 : x
  2. Step 2: Convert to fraction form
    112.53/155.28 = 77.58/x
  3. Step 3: Cross multiply
    112.53x = 155.28 × 77.58
  4. Step 4: Simplify right side
    112.53x = 12,046.62
  5. Step 5: Solve for x
    x = 12,046.62/112.53
  6. Step 6: Final answer
    x = 107.05

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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.