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Finding the Fourth Proportional to 38,489.80, 57,740.10 and 12,191.80

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Solution

The fourth proportional to 38,489.80, 57,740.10 and 12,191.80 is: 18,289.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,489.80 : 57,740.10 = 12,191.80 : x
  2. Step 2: Convert to fraction form
    38,489.80/57,740.10 = 12,191.80/x
  3. Step 3: Cross multiply
    38,489.80x = 57,740.10 × 12,191.80
  4. Step 4: Simplify right side
    38,489.80x = 703,955,751.18
  5. Step 5: Solve for x
    x = 703,955,751.18/38,489.80
  6. Step 6: Final answer
    x = 18,289.41

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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.