Home / 12,278.20-16,936.68-8,689.12

Finding the Fourth Proportional to 12,278.20, 16,936.68 and 8,689.12

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Solution

The fourth proportional to 12,278.20, 16,936.68 and 8,689.12 is: 11,985.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,278.20 : 16,936.68 = 8,689.12 : x
  2. Step 2: Convert to fraction form
    12,278.20/16,936.68 = 8,689.12/x
  3. Step 3: Cross multiply
    12,278.20x = 16,936.68 × 8,689.12
  4. Step 4: Simplify right side
    12,278.20x = 147,164,844.92
  5. Step 5: Solve for x
    x = 147,164,844.92/12,278.20
  6. Step 6: Final answer
    x = 11,985.86

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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.