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Finding the Fourth Proportional to 5.31, 7.31 and 4.87

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Solution

The fourth proportional to 5.31, 7.31 and 4.87 is: 6.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.31 : 7.31 = 4.87 : x
  2. Step 2: Convert to fraction form
    5.31/7.31 = 4.87/x
  3. Step 3: Cross multiply
    5.31x = 7.31 × 4.87
  4. Step 4: Simplify right side
    5.31x = 35.60
  5. Step 5: Solve for x
    x = 35.60/5.31
  6. Step 6: Final answer
    x = 6.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.