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Finding the Fourth Proportional to 12,480.70, 18,724.05 and 4,160.80

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Solution

The fourth proportional to 12,480.70, 18,724.05 and 4,160.80 is: 6,242.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.70 : 18,724.05 = 4,160.80 : x
  2. Step 2: Convert to fraction form
    12,480.70/18,724.05 = 4,160.80/x
  3. Step 3: Cross multiply
    12,480.70x = 18,724.05 × 4,160.80
  4. Step 4: Simplify right side
    12,480.70x = 77,907,027.24
  5. Step 5: Solve for x
    x = 77,907,027.24/12,480.70
  6. Step 6: Final answer
    x = 6,242.20

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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.