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Finding the Fourth Proportional to 112.80, 155.61 and 69.12

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Solution

The fourth proportional to 112.80, 155.61 and 69.12 is: 95.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.80 : 155.61 = 69.12 : x
  2. Step 2: Convert to fraction form
    112.80/155.61 = 69.12/x
  3. Step 3: Cross multiply
    112.80x = 155.61 × 69.12
  4. Step 4: Simplify right side
    112.80x = 10,755.76
  5. Step 5: Solve for x
    x = 10,755.76/112.80
  6. Step 6: Final answer
    x = 95.35

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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.