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Finding the Fourth Proportional to 66.81, 100.22 and 26.21

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Solution

The fourth proportional to 66.81, 100.22 and 26.21 is: 39.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.81 : 100.22 = 26.21 : x
  2. Step 2: Convert to fraction form
    66.81/100.22 = 26.21/x
  3. Step 3: Cross multiply
    66.81x = 100.22 × 26.21
  4. Step 4: Simplify right side
    66.81x = 2,626.47
  5. Step 5: Solve for x
    x = 2,626.47/66.81
  6. Step 6: Final answer
    x = 39.31

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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.