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Finding the Fourth Proportional to 71.70, 108.07 and 67.24

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Solution

The fourth proportional to 71.70, 108.07 and 67.24 is: 101.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.70 : 108.07 = 67.24 : x
  2. Step 2: Convert to fraction form
    71.70/108.07 = 67.24/x
  3. Step 3: Cross multiply
    71.70x = 108.07 × 67.24
  4. Step 4: Simplify right side
    71.70x = 7,266.63
  5. Step 5: Solve for x
    x = 7,266.63/71.70
  6. Step 6: Final answer
    x = 101.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.