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Finding the Fourth Proportional to 886.58, 1,218.47 and 689.75

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Solution

The fourth proportional to 886.58, 1,218.47 and 689.75 is: 947.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.58 : 1,218.47 = 689.75 : x
  2. Step 2: Convert to fraction form
    886.58/1,218.47 = 689.75/x
  3. Step 3: Cross multiply
    886.58x = 1,218.47 × 689.75
  4. Step 4: Simplify right side
    886.58x = 840,439.68
  5. Step 5: Solve for x
    x = 840,439.68/886.58
  6. Step 6: Final answer
    x = 947.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.