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Finding the Fourth Proportional to 67.50, 101.25 and 64.61

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Solution

The fourth proportional to 67.50, 101.25 and 64.61 is: 96.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.50 : 101.25 = 64.61 : x
  2. Step 2: Convert to fraction form
    67.50/101.25 = 64.61/x
  3. Step 3: Cross multiply
    67.50x = 101.25 × 64.61
  4. Step 4: Simplify right side
    67.50x = 6,542.21
  5. Step 5: Solve for x
    x = 6,542.21/67.50
  6. Step 6: Final answer
    x = 96.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.