Home / 28,731.39-39,674.25-21,190.80

Finding the Fourth Proportional to 28,731.39, 39,674.25 and 21,190.80

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Solution

The fourth proportional to 28,731.39, 39,674.25 and 21,190.80 is: 29,261.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,731.39 : 39,674.25 = 21,190.80 : x
  2. Step 2: Convert to fraction form
    28,731.39/39,674.25 = 21,190.80/x
  3. Step 3: Cross multiply
    28,731.39x = 39,674.25 × 21,190.80
  4. Step 4: Simplify right side
    28,731.39x = 840,729,096.90
  5. Step 5: Solve for x
    x = 840,729,096.90/28,731.39
  6. Step 6: Final answer
    x = 29,261.69

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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.