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Finding the Fourth Proportional to 66.07, 90.90 and 60.24

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Solution

The fourth proportional to 66.07, 90.90 and 60.24 is: 82.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.07 : 90.90 = 60.24 : x
  2. Step 2: Convert to fraction form
    66.07/90.90 = 60.24/x
  3. Step 3: Cross multiply
    66.07x = 90.90 × 60.24
  4. Step 4: Simplify right side
    66.07x = 5,475.82
  5. Step 5: Solve for x
    x = 5,475.82/66.07
  6. Step 6: Final answer
    x = 82.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.