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Finding the Fourth Proportional to 89.19, 133.85 and 77.89

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Solution

The fourth proportional to 89.19, 133.85 and 77.89 is: 116.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.19 : 133.85 = 77.89 : x
  2. Step 2: Convert to fraction form
    89.19/133.85 = 77.89/x
  3. Step 3: Cross multiply
    89.19x = 133.85 × 77.89
  4. Step 4: Simplify right side
    89.19x = 10,425.58
  5. Step 5: Solve for x
    x = 10,425.58/89.19
  6. Step 6: Final answer
    x = 116.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.