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Finding the Fourth Proportional to 89.64, 133.86 and 77.48

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Solution

The fourth proportional to 89.64, 133.86 and 77.48 is: 115.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.64 : 133.86 = 77.48 : x
  2. Step 2: Convert to fraction form
    89.64/133.86 = 77.48/x
  3. Step 3: Cross multiply
    89.64x = 133.86 × 77.48
  4. Step 4: Simplify right side
    89.64x = 10,371.47
  5. Step 5: Solve for x
    x = 10,371.47/89.64
  6. Step 6: Final answer
    x = 115.70

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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.