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Finding the Fourth Proportional to 10.85, 15.05 and 10.74

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Solution

The fourth proportional to 10.85, 15.05 and 10.74 is: 14.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.85 : 15.05 = 10.74 : x
  2. Step 2: Convert to fraction form
    10.85/15.05 = 10.74/x
  3. Step 3: Cross multiply
    10.85x = 15.05 × 10.74
  4. Step 4: Simplify right side
    10.85x = 161.66
  5. Step 5: Solve for x
    x = 161.66/10.85
  6. Step 6: Final answer
    x = 14.91

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.