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Finding the Fourth Proportional to 106.72, 159.82 and 66.02

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Solution

The fourth proportional to 106.72, 159.82 and 66.02 is: 98.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.72 : 159.82 = 66.02 : x
  2. Step 2: Convert to fraction form
    106.72/159.82 = 66.02/x
  3. Step 3: Cross multiply
    106.72x = 159.82 × 66.02
  4. Step 4: Simplify right side
    106.72x = 10,550.72
  5. Step 5: Solve for x
    x = 10,550.72/106.72
  6. Step 6: Final answer
    x = 98.87

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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.