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Finding the Fourth Proportional to 89.88, 133.80 and 89.04

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Solution

The fourth proportional to 89.88, 133.80 and 89.04 is: 132.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.88 : 133.80 = 89.04 : x
  2. Step 2: Convert to fraction form
    89.88/133.80 = 89.04/x
  3. Step 3: Cross multiply
    89.88x = 133.80 × 89.04
  4. Step 4: Simplify right side
    89.88x = 11,913.55
  5. Step 5: Solve for x
    x = 11,913.55/89.88
  6. Step 6: Final answer
    x = 132.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.