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Finding the Fourth Proportional to 112.62, 155.06 and 89.25

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Solution

The fourth proportional to 112.62, 155.06 and 89.25 is: 122.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.62 : 155.06 = 89.25 : x
  2. Step 2: Convert to fraction form
    112.62/155.06 = 89.25/x
  3. Step 3: Cross multiply
    112.62x = 155.06 × 89.25
  4. Step 4: Simplify right side
    112.62x = 13,839.79
  5. Step 5: Solve for x
    x = 13,839.79/112.62
  6. Step 6: Final answer
    x = 122.89

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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.