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Finding the Fourth Proportional to 811.06, 1,215.27 and 567.86

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Solution

The fourth proportional to 811.06, 1,215.27 and 567.86 is: 850.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.06 : 1,215.27 = 567.86 : x
  2. Step 2: Convert to fraction form
    811.06/1,215.27 = 567.86/x
  3. Step 3: Cross multiply
    811.06x = 1,215.27 × 567.86
  4. Step 4: Simplify right side
    811.06x = 690,103.22
  5. Step 5: Solve for x
    x = 690,103.22/811.06
  6. Step 6: Final answer
    x = 850.87

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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.