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Finding the Fourth Proportional to 1,327.57, 1,990.88 and 547.54

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Solution

The fourth proportional to 1,327.57, 1,990.88 and 547.54 is: 821.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.57 : 1,990.88 = 547.54 : x
  2. Step 2: Convert to fraction form
    1,327.57/1,990.88 = 547.54/x
  3. Step 3: Cross multiply
    1,327.57x = 1,990.88 × 547.54
  4. Step 4: Simplify right side
    1,327.57x = 1,090,086.44
  5. Step 5: Solve for x
    x = 1,090,086.44/1,327.57
  6. Step 6: Final answer
    x = 821.11

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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.