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Finding the Fourth Proportional to 5.48, 8.21 and 5.31

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Solution

The fourth proportional to 5.48, 8.21 and 5.31 is: 7.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.48 : 8.21 = 5.31 : x
  2. Step 2: Convert to fraction form
    5.48/8.21 = 5.31/x
  3. Step 3: Cross multiply
    5.48x = 8.21 × 5.31
  4. Step 4: Simplify right side
    5.48x = 43.57
  5. Step 5: Solve for x
    x = 43.57/5.48
  6. Step 6: Final answer
    x = 7.96

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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.