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Finding the Fourth Proportional to 811.92, 1,217.66 and 264.49

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Solution

The fourth proportional to 811.92, 1,217.66 and 264.49 is: 396.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.92 : 1,217.66 = 264.49 : x
  2. Step 2: Convert to fraction form
    811.92/1,217.66 = 264.49/x
  3. Step 3: Cross multiply
    811.92x = 1,217.66 × 264.49
  4. Step 4: Simplify right side
    811.92x = 322,058.70
  5. Step 5: Solve for x
    x = 322,058.70/811.92
  6. Step 6: Final answer
    x = 396.66

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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.