Home / 8,318.80-12,478.20-3,123.60

Finding the Fourth Proportional to 8,318.80, 12,478.20 and 3,123.60

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Solution

The fourth proportional to 8,318.80, 12,478.20 and 3,123.60 is: 4,685.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,318.80 : 12,478.20 = 3,123.60 : x
  2. Step 2: Convert to fraction form
    8,318.80/12,478.20 = 3,123.60/x
  3. Step 3: Cross multiply
    8,318.80x = 12,478.20 × 3,123.60
  4. Step 4: Simplify right side
    8,318.80x = 38,976,905.52
  5. Step 5: Solve for x
    x = 38,976,905.52/8,318.80
  6. Step 6: Final answer
    x = 4,685.40

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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.