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Finding the Fourth Proportional to 48.12, 71.86 and 42.05

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Solution

The fourth proportional to 48.12, 71.86 and 42.05 is: 62.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.12 : 71.86 = 42.05 : x
  2. Step 2: Convert to fraction form
    48.12/71.86 = 42.05/x
  3. Step 3: Cross multiply
    48.12x = 71.86 × 42.05
  4. Step 4: Simplify right side
    48.12x = 3,021.35
  5. Step 5: Solve for x
    x = 3,021.35/48.12
  6. Step 6: Final answer
    x = 62.79

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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.