Home / 8,278.40-12,403.20-6,809.60

Finding the Fourth Proportional to 8,278.40, 12,403.20 and 6,809.60

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Solution

The fourth proportional to 8,278.40, 12,403.20 and 6,809.60 is: 10,202.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,278.40 : 12,403.20 = 6,809.60 : x
  2. Step 2: Convert to fraction form
    8,278.40/12,403.20 = 6,809.60/x
  3. Step 3: Cross multiply
    8,278.40x = 12,403.20 × 6,809.60
  4. Step 4: Simplify right side
    8,278.40x = 84,460,830.72
  5. Step 5: Solve for x
    x = 84,460,830.72/8,278.40
  6. Step 6: Final answer
    x = 10,202.55

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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.