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Finding the Fourth Proportional to 112.71, 169.08 and 54.93

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Solution

The fourth proportional to 112.71, 169.08 and 54.93 is: 82.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.71 : 169.08 = 54.93 : x
  2. Step 2: Convert to fraction form
    112.71/169.08 = 54.93/x
  3. Step 3: Cross multiply
    112.71x = 169.08 × 54.93
  4. Step 4: Simplify right side
    112.71x = 9,287.56
  5. Step 5: Solve for x
    x = 9,287.56/112.71
  6. Step 6: Final answer
    x = 82.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.