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Finding the Fourth Proportional to 1,218.30, 1,679.43 and 886.20

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Solution

The fourth proportional to 1,218.30, 1,679.43 and 886.20 is: 1,221.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.30 : 1,679.43 = 886.20 : x
  2. Step 2: Convert to fraction form
    1,218.30/1,679.43 = 886.20/x
  3. Step 3: Cross multiply
    1,218.30x = 1,679.43 × 886.20
  4. Step 4: Simplify right side
    1,218.30x = 1,488,310.87
  5. Step 5: Solve for x
    x = 1,488,310.87/1,218.30
  6. Step 6: Final answer
    x = 1,221.63

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1.5x scale

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.