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Finding the Fourth Proportional to 10.59, 15.86 and 8.18

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Solution

The fourth proportional to 10.59, 15.86 and 8.18 is: 12.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.59 : 15.86 = 8.18 : x
  2. Step 2: Convert to fraction form
    10.59/15.86 = 8.18/x
  3. Step 3: Cross multiply
    10.59x = 15.86 × 8.18
  4. Step 4: Simplify right side
    10.59x = 129.73
  5. Step 5: Solve for x
    x = 129.73/10.59
  6. Step 6: Final answer
    x = 12.25

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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.