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Finding the Fourth Proportional to 112.95, 155.97 and 69.39

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Solution

The fourth proportional to 112.95, 155.97 and 69.39 is: 95.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.95 : 155.97 = 69.39 : x
  2. Step 2: Convert to fraction form
    112.95/155.97 = 69.39/x
  3. Step 3: Cross multiply
    112.95x = 155.97 × 69.39
  4. Step 4: Simplify right side
    112.95x = 10,822.76
  5. Step 5: Solve for x
    x = 10,822.76/112.95
  6. Step 6: Final answer
    x = 95.82

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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.