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Finding the Fourth Proportional to 112.87, 169.08 and 72.19

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Solution

The fourth proportional to 112.87, 169.08 and 72.19 is: 108.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.87 : 169.08 = 72.19 : x
  2. Step 2: Convert to fraction form
    112.87/169.08 = 72.19/x
  3. Step 3: Cross multiply
    112.87x = 169.08 × 72.19
  4. Step 4: Simplify right side
    112.87x = 12,205.89
  5. Step 5: Solve for x
    x = 12,205.89/112.87
  6. Step 6: Final answer
    x = 108.14

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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.