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Finding the Fourth Proportional to 45.02, 67.62 and 39.80

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Solution

The fourth proportional to 45.02, 67.62 and 39.80 is: 59.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.02 : 67.62 = 39.80 : x
  2. Step 2: Convert to fraction form
    45.02/67.62 = 39.80/x
  3. Step 3: Cross multiply
    45.02x = 67.62 × 39.80
  4. Step 4: Simplify right side
    45.02x = 2,691.28
  5. Step 5: Solve for x
    x = 2,691.28/45.02
  6. Step 6: Final answer
    x = 59.78

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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.