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Finding the Fourth Proportional to 48.31, 72.07 and 40.75

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Solution

The fourth proportional to 48.31, 72.07 and 40.75 is: 60.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.31 : 72.07 = 40.75 : x
  2. Step 2: Convert to fraction form
    48.31/72.07 = 40.75/x
  3. Step 3: Cross multiply
    48.31x = 72.07 × 40.75
  4. Step 4: Simplify right side
    48.31x = 2,936.85
  5. Step 5: Solve for x
    x = 2,936.85/48.31
  6. Step 6: Final answer
    x = 60.79

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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.