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Finding the Fourth Proportional to 543.74, 748.40 and 396.09

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Solution

The fourth proportional to 543.74, 748.40 and 396.09 is: 545.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.74 : 748.40 = 396.09 : x
  2. Step 2: Convert to fraction form
    543.74/748.40 = 396.09/x
  3. Step 3: Cross multiply
    543.74x = 748.40 × 396.09
  4. Step 4: Simplify right side
    543.74x = 296,431.78
  5. Step 5: Solve for x
    x = 296,431.78/543.74
  6. Step 6: Final answer
    x = 545.18

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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.