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Finding the Fourth Proportional to 2,138.89, 2,950.14 and 1,391.46

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Solution

The fourth proportional to 2,138.89, 2,950.14 and 1,391.46 is: 1,919.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.89 : 2,950.14 = 1,391.46 : x
  2. Step 2: Convert to fraction form
    2,138.89/2,950.14 = 1,391.46/x
  3. Step 3: Cross multiply
    2,138.89x = 2,950.14 × 1,391.46
  4. Step 4: Simplify right side
    2,138.89x = 4,105,001.80
  5. Step 5: Solve for x
    x = 4,105,001.80/2,138.89
  6. Step 6: Final answer
    x = 1,919.22

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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.