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Finding the Fourth Proportional to 48.88, 67.12 and 42.20

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Solution

The fourth proportional to 48.88, 67.12 and 42.20 is: 57.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.88 : 67.12 = 42.20 : x
  2. Step 2: Convert to fraction form
    48.88/67.12 = 42.20/x
  3. Step 3: Cross multiply
    48.88x = 67.12 × 42.20
  4. Step 4: Simplify right side
    48.88x = 2,832.46
  5. Step 5: Solve for x
    x = 2,832.46/48.88
  6. Step 6: Final answer
    x = 57.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.