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Finding the Fourth Proportional to 886.47, 1,223.77 and 686.85

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Solution

The fourth proportional to 886.47, 1,223.77 and 686.85 is: 948.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.47 : 1,223.77 = 686.85 : x
  2. Step 2: Convert to fraction form
    886.47/1,223.77 = 686.85/x
  3. Step 3: Cross multiply
    886.47x = 1,223.77 × 686.85
  4. Step 4: Simplify right side
    886.47x = 840,546.42
  5. Step 5: Solve for x
    x = 840,546.42/886.47
  6. Step 6: Final answer
    x = 948.20

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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.