Home / 12,279.20-16,938.06-8,690.12

Finding the Fourth Proportional to 12,279.20, 16,938.06 and 8,690.12

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Solution

The fourth proportional to 12,279.20, 16,938.06 and 8,690.12 is: 11,987.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.20 : 16,938.06 = 8,690.12 : x
  2. Step 2: Convert to fraction form
    12,279.20/16,938.06 = 8,690.12/x
  3. Step 3: Cross multiply
    12,279.20x = 16,938.06 × 8,690.12
  4. Step 4: Simplify right side
    12,279.20x = 147,193,773.97
  5. Step 5: Solve for x
    x = 147,193,773.97/12,279.20
  6. Step 6: Final answer
    x = 11,987.24

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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.