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Finding the Fourth Proportional to 66.01, 98.98 and 55.21

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Solution

The fourth proportional to 66.01, 98.98 and 55.21 is: 82.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.01 : 98.98 = 55.21 : x
  2. Step 2: Convert to fraction form
    66.01/98.98 = 55.21/x
  3. Step 3: Cross multiply
    66.01x = 98.98 × 55.21
  4. Step 4: Simplify right side
    66.01x = 5,464.69
  5. Step 5: Solve for x
    x = 5,464.69/66.01
  6. Step 6: Final answer
    x = 82.79

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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.