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Finding the Fourth Proportional to 5.52, 8.21 and 5.45

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Solution

The fourth proportional to 5.52, 8.21 and 5.45 is: 8.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.52 : 8.21 = 5.45 : x
  2. Step 2: Convert to fraction form
    5.52/8.21 = 5.45/x
  3. Step 3: Cross multiply
    5.52x = 8.21 × 5.45
  4. Step 4: Simplify right side
    5.52x = 44.74
  5. Step 5: Solve for x
    x = 44.74/5.52
  6. Step 6: Final answer
    x = 8.11

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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.