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Finding the Fourth Proportional to 43.28, 64.88 and 38.72

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Solution

The fourth proportional to 43.28, 64.88 and 38.72 is: 58.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.28 : 64.88 = 38.72 : x
  2. Step 2: Convert to fraction form
    43.28/64.88 = 38.72/x
  3. Step 3: Cross multiply
    43.28x = 64.88 × 38.72
  4. Step 4: Simplify right side
    43.28x = 2,512.15
  5. Step 5: Solve for x
    x = 2,512.15/43.28
  6. Step 6: Final answer
    x = 58.04

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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.