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Finding the Fourth Proportional to 66.39, 99.69 and 63.21

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Solution

The fourth proportional to 66.39, 99.69 and 63.21 is: 94.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.39 : 99.69 = 63.21 : x
  2. Step 2: Convert to fraction form
    66.39/99.69 = 63.21/x
  3. Step 3: Cross multiply
    66.39x = 99.69 × 63.21
  4. Step 4: Simplify right side
    66.39x = 6,301.40
  5. Step 5: Solve for x
    x = 6,301.40/66.39
  6. Step 6: Final answer
    x = 94.91

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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.