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Finding the Fourth Proportional to 5.31, 7.92 and 5.10

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Solution

The fourth proportional to 5.31, 7.92 and 5.10 is: 7.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.31 : 7.92 = 5.10 : x
  2. Step 2: Convert to fraction form
    5.31/7.92 = 5.10/x
  3. Step 3: Cross multiply
    5.31x = 7.92 × 5.10
  4. Step 4: Simplify right side
    5.31x = 40.39
  5. Step 5: Solve for x
    x = 40.39/5.31
  6. Step 6: Final answer
    x = 7.61

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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.