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Finding the Fourth Proportional to 20.95, 28.87 and 15.76

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Solution

The fourth proportional to 20.95, 28.87 and 15.76 is: 21.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.95 : 28.87 = 15.76 : x
  2. Step 2: Convert to fraction form
    20.95/28.87 = 15.76/x
  3. Step 3: Cross multiply
    20.95x = 28.87 × 15.76
  4. Step 4: Simplify right side
    20.95x = 454.99
  5. Step 5: Solve for x
    x = 454.99/20.95
  6. Step 6: Final answer
    x = 21.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.