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Finding the Fourth Proportional to 8.31, 12.46 and 4.31

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Solution

The fourth proportional to 8.31, 12.46 and 4.31 is: 6.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.31 : 12.46 = 4.31 : x
  2. Step 2: Convert to fraction form
    8.31/12.46 = 4.31/x
  3. Step 3: Cross multiply
    8.31x = 12.46 × 4.31
  4. Step 4: Simplify right side
    8.31x = 53.64
  5. Step 5: Solve for x
    x = 53.64/8.31
  6. Step 6: Final answer
    x = 6.45

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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.