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Finding the Fourth Proportional to 8,129.80, 12,209.10 and 6,285.40

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Solution

The fourth proportional to 8,129.80, 12,209.10 and 6,285.40 is: 9,439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,129.80 : 12,209.10 = 6,285.40 : x
  2. Step 2: Convert to fraction form
    8,129.80/12,209.10 = 6,285.40/x
  3. Step 3: Cross multiply
    8,129.80x = 12,209.10 × 6,285.40
  4. Step 4: Simplify right side
    8,129.80x = 76,739,077.14
  5. Step 5: Solve for x
    x = 76,739,077.14/8,129.80
  6. Step 6: Final answer
    x = 9,439.23

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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.