Home / 11,487.14-17,220.30-7,978.80

Finding the Fourth Proportional to 11,487.14, 17,220.30 and 7,978.80

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Solution

The fourth proportional to 11,487.14, 17,220.30 and 7,978.80 is: 11,960.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,487.14 : 17,220.30 = 7,978.80 : x
  2. Step 2: Convert to fraction form
    11,487.14/17,220.30 = 7,978.80/x
  3. Step 3: Cross multiply
    11,487.14x = 17,220.30 × 7,978.80
  4. Step 4: Simplify right side
    11,487.14x = 137,397,329.64
  5. Step 5: Solve for x
    x = 137,397,329.64/11,487.14
  6. Step 6: Final answer
    x = 11,960.97

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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.