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Finding the Fourth Proportional to 67.92, 93.16 and 65.56

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Solution

The fourth proportional to 67.92, 93.16 and 65.56 is: 89.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.92 : 93.16 = 65.56 : x
  2. Step 2: Convert to fraction form
    67.92/93.16 = 65.56/x
  3. Step 3: Cross multiply
    67.92x = 93.16 × 65.56
  4. Step 4: Simplify right side
    67.92x = 6,107.57
  5. Step 5: Solve for x
    x = 6,107.57/67.92
  6. Step 6: Final answer
    x = 89.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.