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Finding the Fourth Proportional to 12,426.80, 18,640.20 and 4,218.80

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Solution

The fourth proportional to 12,426.80, 18,640.20 and 4,218.80 is: 6,328.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,426.80 : 18,640.20 = 4,218.80 : x
  2. Step 2: Convert to fraction form
    12,426.80/18,640.20 = 4,218.80/x
  3. Step 3: Cross multiply
    12,426.80x = 18,640.20 × 4,218.80
  4. Step 4: Simplify right side
    12,426.80x = 78,639,275.76
  5. Step 5: Solve for x
    x = 78,639,275.76/12,426.80
  6. Step 6: Final answer
    x = 6,328.20

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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.