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Finding the Fourth Proportional to 10.38, 15.60 and 8.68

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Solution

The fourth proportional to 10.38, 15.60 and 8.68 is: 13.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.38 : 15.60 = 8.68 : x
  2. Step 2: Convert to fraction form
    10.38/15.60 = 8.68/x
  3. Step 3: Cross multiply
    10.38x = 15.60 × 8.68
  4. Step 4: Simplify right side
    10.38x = 135.41
  5. Step 5: Solve for x
    x = 135.41/10.38
  6. Step 6: Final answer
    x = 13.05

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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.