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Finding the Fourth Proportional to 10.72, 16.08 and 8.59

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Solution

The fourth proportional to 10.72, 16.08 and 8.59 is: 12.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.72 : 16.08 = 8.59 : x
  2. Step 2: Convert to fraction form
    10.72/16.08 = 8.59/x
  3. Step 3: Cross multiply
    10.72x = 16.08 × 8.59
  4. Step 4: Simplify right side
    10.72x = 138.13
  5. Step 5: Solve for x
    x = 138.13/10.72
  6. Step 6: Final answer
    x = 12.89

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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.