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Finding the Fourth Proportional to 19,940.80, 27,520.80 and 11,987.20

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Solution

The fourth proportional to 19,940.80, 27,520.80 and 11,987.20 is: 16,543.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,940.80 : 27,520.80 = 11,987.20 : x
  2. Step 2: Convert to fraction form
    19,940.80/27,520.80 = 11,987.20/x
  3. Step 3: Cross multiply
    19,940.80x = 27,520.80 × 11,987.20
  4. Step 4: Simplify right side
    19,940.80x = 329,897,333.76
  5. Step 5: Solve for x
    x = 329,897,333.76/19,940.80
  6. Step 6: Final answer
    x = 16,543.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.