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Finding the Fourth Proportional to 89.70, 134.47 and 66.97

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Solution

The fourth proportional to 89.70, 134.47 and 66.97 is: 100.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.70 : 134.47 = 66.97 : x
  2. Step 2: Convert to fraction form
    89.70/134.47 = 66.97/x
  3. Step 3: Cross multiply
    89.70x = 134.47 × 66.97
  4. Step 4: Simplify right side
    89.70x = 9,005.46
  5. Step 5: Solve for x
    x = 9,005.46/89.70
  6. Step 6: Final answer
    x = 100.40

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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.