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Finding the Fourth Proportional to 48.75, 67.31 and 31.53

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Solution

The fourth proportional to 48.75, 67.31 and 31.53 is: 43.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.75 : 67.31 = 31.53 : x
  2. Step 2: Convert to fraction form
    48.75/67.31 = 31.53/x
  3. Step 3: Cross multiply
    48.75x = 67.31 × 31.53
  4. Step 4: Simplify right side
    48.75x = 2,122.13
  5. Step 5: Solve for x
    x = 2,122.13/48.75
  6. Step 6: Final answer
    x = 43.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.