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Finding the Fourth Proportional to 71.26, 106.21 and 66.67

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Solution

The fourth proportional to 71.26, 106.21 and 66.67 is: 99.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.26 : 106.21 = 66.67 : x
  2. Step 2: Convert to fraction form
    71.26/106.21 = 66.67/x
  3. Step 3: Cross multiply
    71.26x = 106.21 × 66.67
  4. Step 4: Simplify right side
    71.26x = 7,081.19
  5. Step 5: Solve for x
    x = 7,081.19/71.26
  6. Step 6: Final answer
    x = 99.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.