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Finding the Fourth Proportional to 89.64, 134.56 and 66.59

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Solution

The fourth proportional to 89.64, 134.56 and 66.59 is: 99.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.64 : 134.56 = 66.59 : x
  2. Step 2: Convert to fraction form
    89.64/134.56 = 66.59/x
  3. Step 3: Cross multiply
    89.64x = 134.56 × 66.59
  4. Step 4: Simplify right side
    89.64x = 8,960.27
  5. Step 5: Solve for x
    x = 8,960.27/89.64
  6. Step 6: Final answer
    x = 99.96

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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.