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Finding the Fourth Proportional to 10.31, 14.20 and 10.05

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Solution

The fourth proportional to 10.31, 14.20 and 10.05 is: 13.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.31 : 14.20 = 10.05 : x
  2. Step 2: Convert to fraction form
    10.31/14.20 = 10.05/x
  3. Step 3: Cross multiply
    10.31x = 14.20 × 10.05
  4. Step 4: Simplify right side
    10.31x = 142.75
  5. Step 5: Solve for x
    x = 142.75/10.31
  6. Step 6: Final answer
    x = 13.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.