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Finding the Fourth Proportional to 6.31, 9.42 and 5.57

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Solution

The fourth proportional to 6.31, 9.42 and 5.57 is: 8.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.31 : 9.42 = 5.57 : x
  2. Step 2: Convert to fraction form
    6.31/9.42 = 5.57/x
  3. Step 3: Cross multiply
    6.31x = 9.42 × 5.57
  4. Step 4: Simplify right side
    6.31x = 52.44
  5. Step 5: Solve for x
    x = 52.44/6.31
  6. Step 6: Final answer
    x = 8.31

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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.