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Finding the Fourth Proportional to 19,959.80, 29,939.70 and 18,987.80

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Solution

The fourth proportional to 19,959.80, 29,939.70 and 18,987.80 is: 28,481.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,959.80 : 29,939.70 = 18,987.80 : x
  2. Step 2: Convert to fraction form
    19,959.80/29,939.70 = 18,987.80/x
  3. Step 3: Cross multiply
    19,959.80x = 29,939.70 × 18,987.80
  4. Step 4: Simplify right side
    19,959.80x = 568,489,035.66
  5. Step 5: Solve for x
    x = 568,489,035.66/19,959.80
  6. Step 6: Final answer
    x = 28,481.70

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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.