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Finding the Fourth Proportional to 400.86, 552.69 and 331.20

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Solution

The fourth proportional to 400.86, 552.69 and 331.20 is: 456.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.86 : 552.69 = 331.20 : x
  2. Step 2: Convert to fraction form
    400.86/552.69 = 331.20/x
  3. Step 3: Cross multiply
    400.86x = 552.69 × 331.20
  4. Step 4: Simplify right side
    400.86x = 183,050.93
  5. Step 5: Solve for x
    x = 183,050.93/400.86
  6. Step 6: Final answer
    x = 456.65

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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.