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Finding the Fourth Proportional to 10.68, 15.90 and 10.62

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Solution

The fourth proportional to 10.68, 15.90 and 10.62 is: 15.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.68 : 15.90 = 10.62 : x
  2. Step 2: Convert to fraction form
    10.68/15.90 = 10.62/x
  3. Step 3: Cross multiply
    10.68x = 15.90 × 10.62
  4. Step 4: Simplify right side
    10.68x = 168.86
  5. Step 5: Solve for x
    x = 168.86/10.68
  6. Step 6: Final answer
    x = 15.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.