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Finding the Fourth Proportional to 112.68, 155.49 and 62.88

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Solution

The fourth proportional to 112.68, 155.49 and 62.88 is: 86.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.68 : 155.49 = 62.88 : x
  2. Step 2: Convert to fraction form
    112.68/155.49 = 62.88/x
  3. Step 3: Cross multiply
    112.68x = 155.49 × 62.88
  4. Step 4: Simplify right side
    112.68x = 9,777.21
  5. Step 5: Solve for x
    x = 9,777.21/112.68
  6. Step 6: Final answer
    x = 86.77

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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.