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Finding the Fourth Proportional to 16, 21.96 and 15.88

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Solution

The fourth proportional to 16, 21.96 and 15.88 is: 21.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    16 : 21.96 = 15.88 : x
  2. Step 2: Convert to fraction form
    16/21.96 = 15.88/x
  3. Step 3: Cross multiply
    16x = 21.96 × 15.88
  4. Step 4: Simplify right side
    16x = 348.72
  5. Step 5: Solve for x
    x = 348.72/16
  6. Step 6: Final answer
    x = 21.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.