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Finding the Fourth Proportional to 8,372.80, 12,542.16 and 6,720.40

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Solution

The fourth proportional to 8,372.80, 12,542.16 and 6,720.40 is: 10,066.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,372.80 : 12,542.16 = 6,720.40 : x
  2. Step 2: Convert to fraction form
    8,372.80/12,542.16 = 6,720.40/x
  3. Step 3: Cross multiply
    8,372.80x = 12,542.16 × 6,720.40
  4. Step 4: Simplify right side
    8,372.80x = 84,288,332.06
  5. Step 5: Solve for x
    x = 84,288,332.06/8,372.80
  6. Step 6: Final answer
    x = 10,066.92

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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.