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Finding the Fourth Proportional to 89.50, 134.29 and 77.39

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Solution

The fourth proportional to 89.50, 134.29 and 77.39 is: 116.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.50 : 134.29 = 77.39 : x
  2. Step 2: Convert to fraction form
    89.50/134.29 = 77.39/x
  3. Step 3: Cross multiply
    89.50x = 134.29 × 77.39
  4. Step 4: Simplify right side
    89.50x = 10,392.85
  5. Step 5: Solve for x
    x = 10,392.85/89.50
  6. Step 6: Final answer
    x = 116.12

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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.