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Finding the Fourth Proportional to 11,220.80, 16,816.80 and 9,982.40

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Solution

The fourth proportional to 11,220.80, 16,816.80 and 9,982.40 is: 14,960.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,220.80 : 16,816.80 = 9,982.40 : x
  2. Step 2: Convert to fraction form
    11,220.80/16,816.80 = 9,982.40/x
  3. Step 3: Cross multiply
    11,220.80x = 16,816.80 × 9,982.40
  4. Step 4: Simplify right side
    11,220.80x = 167,872,024.32
  5. Step 5: Solve for x
    x = 167,872,024.32/11,220.80
  6. Step 6: Final answer
    x = 14,960.79

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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.