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Finding the Fourth Proportional to 19,891.20, 29,836.80 and 18,076.80

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Solution

The fourth proportional to 19,891.20, 29,836.80 and 18,076.80 is: 27,115.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,891.20 : 29,836.80 = 18,076.80 : x
  2. Step 2: Convert to fraction form
    19,891.20/29,836.80 = 18,076.80/x
  3. Step 3: Cross multiply
    19,891.20x = 29,836.80 × 18,076.80
  4. Step 4: Simplify right side
    19,891.20x = 539,353,866.24
  5. Step 5: Solve for x
    x = 539,353,866.24/19,891.20
  6. Step 6: Final answer
    x = 27,115.20

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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.