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Finding the Fourth Proportional to 811.36, 1,217.25 and 291.42

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Solution

The fourth proportional to 811.36, 1,217.25 and 291.42 is: 437.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.36 : 1,217.25 = 291.42 : x
  2. Step 2: Convert to fraction form
    811.36/1,217.25 = 291.42/x
  3. Step 3: Cross multiply
    811.36x = 1,217.25 × 291.42
  4. Step 4: Simplify right side
    811.36x = 354,724.91
  5. Step 5: Solve for x
    x = 354,724.91/811.36
  6. Step 6: Final answer
    x = 437.20

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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.