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Finding the Fourth Proportional to 409.16, 612.88 and 255.16

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Solution

The fourth proportional to 409.16, 612.88 and 255.16 is: 382.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.16 : 612.88 = 255.16 : x
  2. Step 2: Convert to fraction form
    409.16/612.88 = 255.16/x
  3. Step 3: Cross multiply
    409.16x = 612.88 × 255.16
  4. Step 4: Simplify right side
    409.16x = 156,382.46
  5. Step 5: Solve for x
    x = 156,382.46/409.16
  6. Step 6: Final answer
    x = 382.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.