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Finding the Fourth Proportional to 65.28, 89.43 and 64.92

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Solution

The fourth proportional to 65.28, 89.43 and 64.92 is: 88.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.28 : 89.43 = 64.92 : x
  2. Step 2: Convert to fraction form
    65.28/89.43 = 64.92/x
  3. Step 3: Cross multiply
    65.28x = 89.43 × 64.92
  4. Step 4: Simplify right side
    65.28x = 5,805.80
  5. Step 5: Solve for x
    x = 5,805.80/65.28
  6. Step 6: Final answer
    x = 88.94

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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.