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Finding the Fourth Proportional to 547.56, 821.33 and 387.18

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Solution

The fourth proportional to 547.56, 821.33 and 387.18 is: 580.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.56 : 821.33 = 387.18 : x
  2. Step 2: Convert to fraction form
    547.56/821.33 = 387.18/x
  3. Step 3: Cross multiply
    547.56x = 821.33 × 387.18
  4. Step 4: Simplify right side
    547.56x = 317,998.44
  5. Step 5: Solve for x
    x = 317,998.44/547.56
  6. Step 6: Final answer
    x = 580.76

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Double scale
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Similar ratio
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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.