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Finding the Fourth Proportional to 7,272.80, 10,909.20 and 6,408.80

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Solution

The fourth proportional to 7,272.80, 10,909.20 and 6,408.80 is: 9,613.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,272.80 : 10,909.20 = 6,408.80 : x
  2. Step 2: Convert to fraction form
    7,272.80/10,909.20 = 6,408.80/x
  3. Step 3: Cross multiply
    7,272.80x = 10,909.20 × 6,408.80
  4. Step 4: Simplify right side
    7,272.80x = 69,914,880.96
  5. Step 5: Solve for x
    x = 69,914,880.96/7,272.80
  6. Step 6: Final answer
    x = 9,613.20

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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.