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Finding the Fourth Proportional to 112.81, 169.16 and 51.95

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Solution

The fourth proportional to 112.81, 169.16 and 51.95 is: 77.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.81 : 169.16 = 51.95 : x
  2. Step 2: Convert to fraction form
    112.81/169.16 = 51.95/x
  3. Step 3: Cross multiply
    112.81x = 169.16 × 51.95
  4. Step 4: Simplify right side
    112.81x = 8,787.60
  5. Step 5: Solve for x
    x = 8,787.60/112.81
  6. Step 6: Final answer
    x = 77.90

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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.