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Finding the Fourth Proportional to 10.39, 15.61 and 8.51

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Solution

The fourth proportional to 10.39, 15.61 and 8.51 is: 12.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.39 : 15.61 = 8.51 : x
  2. Step 2: Convert to fraction form
    10.39/15.61 = 8.51/x
  3. Step 3: Cross multiply
    10.39x = 15.61 × 8.51
  4. Step 4: Simplify right side
    10.39x = 132.84
  5. Step 5: Solve for x
    x = 132.84/10.39
  6. Step 6: Final answer
    x = 12.79

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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.