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Finding the Fourth Proportional to 409.32, 565.11 and 315.88

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Solution

The fourth proportional to 409.32, 565.11 and 315.88 is: 436.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.32 : 565.11 = 315.88 : x
  2. Step 2: Convert to fraction form
    409.32/565.11 = 315.88/x
  3. Step 3: Cross multiply
    409.32x = 565.11 × 315.88
  4. Step 4: Simplify right side
    409.32x = 178,506.95
  5. Step 5: Solve for x
    x = 178,506.95/409.32
  6. Step 6: Final answer
    x = 436.11

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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.