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Finding the Fourth Proportional to 67.96, 101.21 and 65.57

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Solution

The fourth proportional to 67.96, 101.21 and 65.57 is: 97.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.96 : 101.21 = 65.57 : x
  2. Step 2: Convert to fraction form
    67.96/101.21 = 65.57/x
  3. Step 3: Cross multiply
    67.96x = 101.21 × 65.57
  4. Step 4: Simplify right side
    67.96x = 6,635.83
  5. Step 5: Solve for x
    x = 6,635.83/67.96
  6. Step 6: Final answer
    x = 97.65

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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.