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Finding the Fourth Proportional to 400.55, 552.80 and 243.20

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Solution

The fourth proportional to 400.55, 552.80 and 243.20 is: 335.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.55 : 552.80 = 243.20 : x
  2. Step 2: Convert to fraction form
    400.55/552.80 = 243.20/x
  3. Step 3: Cross multiply
    400.55x = 552.80 × 243.20
  4. Step 4: Simplify right side
    400.55x = 134,442.27
  5. Step 5: Solve for x
    x = 134,442.27/400.55
  6. Step 6: Final answer
    x = 335.65

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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.