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Finding the Fourth Proportional to 47.96, 71.58 and 42.20

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Solution

The fourth proportional to 47.96, 71.58 and 42.20 is: 62.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.96 : 71.58 = 42.20 : x
  2. Step 2: Convert to fraction form
    47.96/71.58 = 42.20/x
  3. Step 3: Cross multiply
    47.96x = 71.58 × 42.20
  4. Step 4: Simplify right side
    47.96x = 3,020.68
  5. Step 5: Solve for x
    x = 3,020.68/47.96
  6. Step 6: Final answer
    x = 62.98

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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.