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Finding the Fourth Proportional to 886.88, 1,222.80 and 689.96

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Solution

The fourth proportional to 886.88, 1,222.80 and 689.96 is: 951.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.88 : 1,222.80 = 689.96 : x
  2. Step 2: Convert to fraction form
    886.88/1,222.80 = 689.96/x
  3. Step 3: Cross multiply
    886.88x = 1,222.80 × 689.96
  4. Step 4: Simplify right side
    886.88x = 843,683.09
  5. Step 5: Solve for x
    x = 843,683.09/886.88
  6. Step 6: Final answer
    x = 951.29

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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.