Home / 12,279.78-16,945.68-6,690.78

Finding the Fourth Proportional to 12,279.78, 16,945.68 and 6,690.78

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Solution

The fourth proportional to 12,279.78, 16,945.68 and 6,690.78 is: 9,233.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.78 : 16,945.68 = 6,690.78 : x
  2. Step 2: Convert to fraction form
    12,279.78/16,945.68 = 6,690.78/x
  3. Step 3: Cross multiply
    12,279.78x = 16,945.68 × 6,690.78
  4. Step 4: Simplify right side
    12,279.78x = 113,379,816.83
  5. Step 5: Solve for x
    x = 113,379,816.83/12,279.78
  6. Step 6: Final answer
    x = 9,233.05

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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.