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Finding the Fourth Proportional to 47.48, 71.26 and 21.79

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Solution

The fourth proportional to 47.48, 71.26 and 21.79 is: 32.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.48 : 71.26 = 21.79 : x
  2. Step 2: Convert to fraction form
    47.48/71.26 = 21.79/x
  3. Step 3: Cross multiply
    47.48x = 71.26 × 21.79
  4. Step 4: Simplify right side
    47.48x = 1,552.76
  5. Step 5: Solve for x
    x = 1,552.76/47.48
  6. Step 6: Final answer
    x = 32.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.