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Finding the Fourth Proportional to 409.39, 565.18 and 315.92

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Solution

The fourth proportional to 409.39, 565.18 and 315.92 is: 436.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.39 : 565.18 = 315.92 : x
  2. Step 2: Convert to fraction form
    409.39/565.18 = 315.92/x
  3. Step 3: Cross multiply
    409.39x = 565.18 × 315.92
  4. Step 4: Simplify right side
    409.39x = 178,552.29
  5. Step 5: Solve for x
    x = 178,552.29/409.39
  6. Step 6: Final answer
    x = 436.14

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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.