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Finding the Fourth Proportional to 408.78, 565.38 and 321.13

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Solution

The fourth proportional to 408.78, 565.38 and 321.13 is: 444.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.78 : 565.38 = 321.13 : x
  2. Step 2: Convert to fraction form
    408.78/565.38 = 321.13/x
  3. Step 3: Cross multiply
    408.78x = 565.38 × 321.13
  4. Step 4: Simplify right side
    408.78x = 181,561.19
  5. Step 5: Solve for x
    x = 181,561.19/408.78
  6. Step 6: Final answer
    x = 444.15

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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.