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Finding the Fourth Proportional to 71.52, 107.88 and 67.08

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Solution

The fourth proportional to 71.52, 107.88 and 67.08 is: 101.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.52 : 107.88 = 67.08 : x
  2. Step 2: Convert to fraction form
    71.52/107.88 = 67.08/x
  3. Step 3: Cross multiply
    71.52x = 107.88 × 67.08
  4. Step 4: Simplify right side
    71.52x = 7,236.59
  5. Step 5: Solve for x
    x = 7,236.59/71.52
  6. Step 6: Final answer
    x = 101.18

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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.