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Finding the Fourth Proportional to 66.38, 99.89 and 50.21

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Solution

The fourth proportional to 66.38, 99.89 and 50.21 is: 75.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.38 : 99.89 = 50.21 : x
  2. Step 2: Convert to fraction form
    66.38/99.89 = 50.21/x
  3. Step 3: Cross multiply
    66.38x = 99.89 × 50.21
  4. Step 4: Simplify right side
    66.38x = 5,015.10
  5. Step 5: Solve for x
    x = 5,015.10/66.38
  6. Step 6: Final answer
    x = 75.56

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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.