Home / 12,279.20-18,423.12-6,435.68

Finding the Fourth Proportional to 12,279.20, 18,423.12 and 6,435.68

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Solution

The fourth proportional to 12,279.20, 18,423.12 and 6,435.68 is: 9,655.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.20 : 18,423.12 = 6,435.68 : x
  2. Step 2: Convert to fraction form
    12,279.20/18,423.12 = 6,435.68/x
  3. Step 3: Cross multiply
    12,279.20x = 18,423.12 × 6,435.68
  4. Step 4: Simplify right side
    12,279.20x = 118,565,304.92
  5. Step 5: Solve for x
    x = 118,565,304.92/12,279.20
  6. Step 6: Final answer
    x = 9,655.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.