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Finding the Fourth Proportional to 10.31, 15.45 and 4.29

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Solution

The fourth proportional to 10.31, 15.45 and 4.29 is: 6.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.31 : 15.45 = 4.29 : x
  2. Step 2: Convert to fraction form
    10.31/15.45 = 4.29/x
  3. Step 3: Cross multiply
    10.31x = 15.45 × 4.29
  4. Step 4: Simplify right side
    10.31x = 66.28
  5. Step 5: Solve for x
    x = 66.28/10.31
  6. Step 6: Final answer
    x = 6.43

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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.