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Finding the Fourth Proportional to 45.28, 67.56 and 39.92

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Solution

The fourth proportional to 45.28, 67.56 and 39.92 is: 59.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.28 : 67.56 = 39.92 : x
  2. Step 2: Convert to fraction form
    45.28/67.56 = 39.92/x
  3. Step 3: Cross multiply
    45.28x = 67.56 × 39.92
  4. Step 4: Simplify right side
    45.28x = 2,697.00
  5. Step 5: Solve for x
    x = 2,697.00/45.28
  6. Step 6: Final answer
    x = 59.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.