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Finding the Fourth Proportional to 811.26, 1,217.09 and 291.29

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Solution

The fourth proportional to 811.26, 1,217.09 and 291.29 is: 437.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.26 : 1,217.09 = 291.29 : x
  2. Step 2: Convert to fraction form
    811.26/1,217.09 = 291.29/x
  3. Step 3: Cross multiply
    811.26x = 1,217.09 × 291.29
  4. Step 4: Simplify right side
    811.26x = 354,520.79
  5. Step 5: Solve for x
    x = 354,520.79/811.26
  6. Step 6: Final answer
    x = 437.00

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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.