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Finding the Fourth Proportional to 10.59, 15.89 and 8.85

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Solution

The fourth proportional to 10.59, 15.89 and 8.85 is: 13.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.59 : 15.89 = 8.85 : x
  2. Step 2: Convert to fraction form
    10.59/15.89 = 8.85/x
  3. Step 3: Cross multiply
    10.59x = 15.89 × 8.85
  4. Step 4: Simplify right side
    10.59x = 140.58
  5. Step 5: Solve for x
    x = 140.58/10.59
  6. Step 6: Final answer
    x = 13.28

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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.