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Finding the Fourth Proportional to 67.28, 92.95 and 64.97

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Solution

The fourth proportional to 67.28, 92.95 and 64.97 is: 89.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.28 : 92.95 = 64.97 : x
  2. Step 2: Convert to fraction form
    67.28/92.95 = 64.97/x
  3. Step 3: Cross multiply
    67.28x = 92.95 × 64.97
  4. Step 4: Simplify right side
    67.28x = 6,038.68
  5. Step 5: Solve for x
    x = 6,038.68/67.28
  6. Step 6: Final answer
    x = 89.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.