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Finding the Fourth Proportional to 811.83, 1,217.76 and 318.17

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Solution

The fourth proportional to 811.83, 1,217.76 and 318.17 is: 477.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.83 : 1,217.76 = 318.17 : x
  2. Step 2: Convert to fraction form
    811.83/1,217.76 = 318.17/x
  3. Step 3: Cross multiply
    811.83x = 1,217.76 × 318.17
  4. Step 4: Simplify right side
    811.83x = 387,454.70
  5. Step 5: Solve for x
    x = 387,454.70/811.83
  6. Step 6: Final answer
    x = 477.26

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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.