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Finding the Fourth Proportional to 18,939.79, 28,408.62 and 5,791.12

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Solution

The fourth proportional to 18,939.79, 28,408.62 and 5,791.12 is: 8,686.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.79 : 28,408.62 = 5,791.12 : x
  2. Step 2: Convert to fraction form
    18,939.79/28,408.62 = 5,791.12/x
  3. Step 3: Cross multiply
    18,939.79x = 28,408.62 × 5,791.12
  4. Step 4: Simplify right side
    18,939.79x = 164,517,727.45
  5. Step 5: Solve for x
    x = 164,517,727.45/18,939.79
  6. Step 6: Final answer
    x = 8,686.35

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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.