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Finding the Fourth Proportional to 2,100.78, 3,150.33 and 945.78

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Solution

The fourth proportional to 2,100.78, 3,150.33 and 945.78 is: 1,418.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.78 : 3,150.33 = 945.78 : x
  2. Step 2: Convert to fraction form
    2,100.78/3,150.33 = 945.78/x
  3. Step 3: Cross multiply
    2,100.78x = 3,150.33 × 945.78
  4. Step 4: Simplify right side
    2,100.78x = 2,979,519.11
  5. Step 5: Solve for x
    x = 2,979,519.11/2,100.78
  6. Step 6: Final answer
    x = 1,418.29

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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.