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Finding the Fourth Proportional to 409.88, 565.92 and 315.20

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Solution

The fourth proportional to 409.88, 565.92 and 315.20 is: 435.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.88 : 565.92 = 315.20 : x
  2. Step 2: Convert to fraction form
    409.88/565.92 = 315.20/x
  3. Step 3: Cross multiply
    409.88x = 565.92 × 315.20
  4. Step 4: Simplify right side
    409.88x = 178,375.15
  5. Step 5: Solve for x
    x = 178,375.15/409.88
  6. Step 6: Final answer
    x = 435.19

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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.