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Finding the Fourth Proportional to 112.56, 155.19 and 77.53

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Solution

The fourth proportional to 112.56, 155.19 and 77.53 is: 106.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.56 : 155.19 = 77.53 : x
  2. Step 2: Convert to fraction form
    112.56/155.19 = 77.53/x
  3. Step 3: Cross multiply
    112.56x = 155.19 × 77.53
  4. Step 4: Simplify right side
    112.56x = 12,030.72
  5. Step 5: Solve for x
    x = 12,030.72/112.56
  6. Step 6: Final answer
    x = 106.88

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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.