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Finding the Fourth Proportional to 112.81, 155.64 and 69.12

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Solution

The fourth proportional to 112.81, 155.64 and 69.12 is: 95.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.81 : 155.64 = 69.12 : x
  2. Step 2: Convert to fraction form
    112.81/155.64 = 69.12/x
  3. Step 3: Cross multiply
    112.81x = 155.64 × 69.12
  4. Step 4: Simplify right side
    112.81x = 10,757.84
  5. Step 5: Solve for x
    x = 10,757.84/112.81
  6. Step 6: Final answer
    x = 95.36

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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.