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Finding the Fourth Proportional to 811.74, 1,217.21 and 372.86

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Solution

The fourth proportional to 811.74, 1,217.21 and 372.86 is: 559.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.74 : 1,217.21 = 372.86 : x
  2. Step 2: Convert to fraction form
    811.74/1,217.21 = 372.86/x
  3. Step 3: Cross multiply
    811.74x = 1,217.21 × 372.86
  4. Step 4: Simplify right side
    811.74x = 453,840.97
  5. Step 5: Solve for x
    x = 453,840.97/811.74
  6. Step 6: Final answer
    x = 559.10

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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.