Home / 12,586.80-18,880.20-8,439.60

Finding the Fourth Proportional to 12,586.80, 18,880.20 and 8,439.60

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Solution

The fourth proportional to 12,586.80, 18,880.20 and 8,439.60 is: 12,659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,586.80 : 18,880.20 = 8,439.60 : x
  2. Step 2: Convert to fraction form
    12,586.80/18,880.20 = 8,439.60/x
  3. Step 3: Cross multiply
    12,586.80x = 18,880.20 × 8,439.60
  4. Step 4: Simplify right side
    12,586.80x = 159,341,335.92
  5. Step 5: Solve for x
    x = 159,341,335.92/12,586.80
  6. Step 6: Final answer
    x = 12,659.40

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Half scale
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Double scale
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Similar ratio
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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.