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Finding the Fourth Proportional to 112.79, 155.66 and 69.15

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Solution

The fourth proportional to 112.79, 155.66 and 69.15 is: 95.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.79 : 155.66 = 69.15 : x
  2. Step 2: Convert to fraction form
    112.79/155.66 = 69.15/x
  3. Step 3: Cross multiply
    112.79x = 155.66 × 69.15
  4. Step 4: Simplify right side
    112.79x = 10,763.89
  5. Step 5: Solve for x
    x = 10,763.89/112.79
  6. Step 6: Final answer
    x = 95.43

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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.