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Finding the Fourth Proportional to 886.79, 1,221.13 and 867.13

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Solution

The fourth proportional to 886.79, 1,221.13 and 867.13 is: 1,194.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.79 : 1,221.13 = 867.13 : x
  2. Step 2: Convert to fraction form
    886.79/1,221.13 = 867.13/x
  3. Step 3: Cross multiply
    886.79x = 1,221.13 × 867.13
  4. Step 4: Simplify right side
    886.79x = 1,058,872.35
  5. Step 5: Solve for x
    x = 1,058,872.35/886.79
  6. Step 6: Final answer
    x = 1,194.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.