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Finding the Fourth Proportional to 128,408.81, 192,486.85 and 75,033.05

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Solution

The fourth proportional to 128,408.81, 192,486.85 and 75,033.05 is: 112,475.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,408.81 : 192,486.85 = 75,033.05 : x
  2. Step 2: Convert to fraction form
    128,408.81/192,486.85 = 75,033.05/x
  3. Step 3: Cross multiply
    128,408.81x = 192,486.85 × 75,033.05
  4. Step 4: Simplify right side
    128,408.81x = 14,442,874,290.38
  5. Step 5: Solve for x
    x = 14,442,874,290.38/128,408.81
  6. Step 6: Final answer
    x = 112,475.73

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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.