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Finding the Fourth Proportional to 7.31, 10.97 and 2.81

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Solution

The fourth proportional to 7.31, 10.97 and 2.81 is: 4.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.31 : 10.97 = 2.81 : x
  2. Step 2: Convert to fraction form
    7.31/10.97 = 2.81/x
  3. Step 3: Cross multiply
    7.31x = 10.97 × 2.81
  4. Step 4: Simplify right side
    7.31x = 30.78
  5. Step 5: Solve for x
    x = 30.78/7.31
  6. Step 6: Final answer
    x = 4.21

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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.