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Finding the Fourth Proportional to 15.66, 21.72 and 14.65

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Solution

The fourth proportional to 15.66, 21.72 and 14.65 is: 20.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.66 : 21.72 = 14.65 : x
  2. Step 2: Convert to fraction form
    15.66/21.72 = 14.65/x
  3. Step 3: Cross multiply
    15.66x = 21.72 × 14.65
  4. Step 4: Simplify right side
    15.66x = 318.20
  5. Step 5: Solve for x
    x = 318.20/15.66
  6. Step 6: Final answer
    x = 20.32

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.