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Finding the Fourth Proportional to 8,601.20, 12,904.20 and 4,218.80

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Solution

The fourth proportional to 8,601.20, 12,904.20 and 4,218.80 is: 6,329.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,601.20 : 12,904.20 = 4,218.80 : x
  2. Step 2: Convert to fraction form
    8,601.20/12,904.20 = 4,218.80/x
  3. Step 3: Cross multiply
    8,601.20x = 12,904.20 × 4,218.80
  4. Step 4: Simplify right side
    8,601.20x = 54,440,238.96
  5. Step 5: Solve for x
    x = 54,440,238.96/8,601.20
  6. Step 6: Final answer
    x = 6,329.38

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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.