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Finding the Fourth Proportional to 47.98, 72.02 and 20.95

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Solution

The fourth proportional to 47.98, 72.02 and 20.95 is: 31.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.98 : 72.02 = 20.95 : x
  2. Step 2: Convert to fraction form
    47.98/72.02 = 20.95/x
  3. Step 3: Cross multiply
    47.98x = 72.02 × 20.95
  4. Step 4: Simplify right side
    47.98x = 1,508.82
  5. Step 5: Solve for x
    x = 1,508.82/47.98
  6. Step 6: Final answer
    x = 31.45

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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.