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Finding the Fourth Proportional to 8,479.76, 12,720.23 and 2,239.70

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Solution

The fourth proportional to 8,479.76, 12,720.23 and 2,239.70 is: 3,359.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.76 : 12,720.23 = 2,239.70 : x
  2. Step 2: Convert to fraction form
    8,479.76/12,720.23 = 2,239.70/x
  3. Step 3: Cross multiply
    8,479.76x = 12,720.23 × 2,239.70
  4. Step 4: Simplify right side
    8,479.76x = 28,489,441.13
  5. Step 5: Solve for x
    x = 28,489,441.13/8,479.76
  6. Step 6: Final answer
    x = 3,359.70

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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.