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Finding the Fourth Proportional to 15.66, 21.65 and 10.85

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Solution

The fourth proportional to 15.66, 21.65 and 10.85 is: 14.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.66 : 21.65 = 10.85 : x
  2. Step 2: Convert to fraction form
    15.66/21.65 = 10.85/x
  3. Step 3: Cross multiply
    15.66x = 21.65 × 10.85
  4. Step 4: Simplify right side
    15.66x = 234.74
  5. Step 5: Solve for x
    x = 234.74/15.66
  6. Step 6: Final answer
    x = 14.99

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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.