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Finding the Fourth Proportional to 8,432.80, 12,649.20 and 7,266.40

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Solution

The fourth proportional to 8,432.80, 12,649.20 and 7,266.40 is: 10,899.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,432.80 : 12,649.20 = 7,266.40 : x
  2. Step 2: Convert to fraction form
    8,432.80/12,649.20 = 7,266.40/x
  3. Step 3: Cross multiply
    8,432.80x = 12,649.20 × 7,266.40
  4. Step 4: Simplify right side
    8,432.80x = 91,914,146.88
  5. Step 5: Solve for x
    x = 91,914,146.88/8,432.80
  6. Step 6: Final answer
    x = 10,899.60

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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.