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Finding the Fourth Proportional to 42.28, 63.41 and 28.76

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Solution

The fourth proportional to 42.28, 63.41 and 28.76 is: 43.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.28 : 63.41 = 28.76 : x
  2. Step 2: Convert to fraction form
    42.28/63.41 = 28.76/x
  3. Step 3: Cross multiply
    42.28x = 63.41 × 28.76
  4. Step 4: Simplify right side
    42.28x = 1,823.67
  5. Step 5: Solve for x
    x = 1,823.67/42.28
  6. Step 6: Final answer
    x = 43.13

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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.