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Finding the Fourth Proportional to 3,859.90, 5,789.78 and 938.18

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Solution

The fourth proportional to 3,859.90, 5,789.78 and 938.18 is: 1,407.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.90 : 5,789.78 = 938.18 : x
  2. Step 2: Convert to fraction form
    3,859.90/5,789.78 = 938.18/x
  3. Step 3: Cross multiply
    3,859.90x = 5,789.78 × 938.18
  4. Step 4: Simplify right side
    3,859.90x = 5,431,855.80
  5. Step 5: Solve for x
    x = 5,431,855.80/3,859.90
  6. Step 6: Final answer
    x = 1,407.25

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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.