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Finding the Fourth Proportional to 20,187.60, 30,238.20 and 17,998.80

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Solution

The fourth proportional to 20,187.60, 30,238.20 and 17,998.80 is: 26,959.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187.60 : 30,238.20 = 17,998.80 : x
  2. Step 2: Convert to fraction form
    20,187.60/30,238.20 = 17,998.80/x
  3. Step 3: Cross multiply
    20,187.60x = 30,238.20 × 17,998.80
  4. Step 4: Simplify right side
    20,187.60x = 544,251,314.16
  5. Step 5: Solve for x
    x = 544,251,314.16/20,187.60
  6. Step 6: Final answer
    x = 26,959.68

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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.