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Finding the Fourth Proportional to 408.18, 612.68 and 317.87

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Solution

The fourth proportional to 408.18, 612.68 and 317.87 is: 477.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.18 : 612.68 = 317.87 : x
  2. Step 2: Convert to fraction form
    408.18/612.68 = 317.87/x
  3. Step 3: Cross multiply
    408.18x = 612.68 × 317.87
  4. Step 4: Simplify right side
    408.18x = 194,752.62
  5. Step 5: Solve for x
    x = 194,752.62/408.18
  6. Step 6: Final answer
    x = 477.12

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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.