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Finding the Fourth Proportional to 48.67, 67.12 and 31.17

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Solution

The fourth proportional to 48.67, 67.12 and 31.17 is: 42.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.67 : 67.12 = 31.17 : x
  2. Step 2: Convert to fraction form
    48.67/67.12 = 31.17/x
  3. Step 3: Cross multiply
    48.67x = 67.12 × 31.17
  4. Step 4: Simplify right side
    48.67x = 2,091.98
  5. Step 5: Solve for x
    x = 2,091.98/48.67
  6. Step 6: Final answer
    x = 42.99

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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.