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Finding the Fourth Proportional to 31.98, 47.99 and 13.95

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Solution

The fourth proportional to 31.98, 47.99 and 13.95 is: 20.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.98 : 47.99 = 13.95 : x
  2. Step 2: Convert to fraction form
    31.98/47.99 = 13.95/x
  3. Step 3: Cross multiply
    31.98x = 47.99 × 13.95
  4. Step 4: Simplify right side
    31.98x = 669.39
  5. Step 5: Solve for x
    x = 669.39/31.98
  6. Step 6: Final answer
    x = 20.93

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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.