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Finding the Fourth Proportional to 12,660.80, 18,991.20 and 5,640.80

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Solution

The fourth proportional to 12,660.80, 18,991.20 and 5,640.80 is: 8,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,660.80 : 18,991.20 = 5,640.80 : x
  2. Step 2: Convert to fraction form
    12,660.80/18,991.20 = 5,640.80/x
  3. Step 3: Cross multiply
    12,660.80x = 18,991.20 × 5,640.80
  4. Step 4: Simplify right side
    12,660.80x = 107,125,560.96
  5. Step 5: Solve for x
    x = 107,125,560.96/12,660.80
  6. Step 6: Final answer
    x = 8,461.20

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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.