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Finding the Fourth Proportional to 2,107.78, 3,162.49 and 874.88

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Solution

The fourth proportional to 2,107.78, 3,162.49 and 874.88 is: 1,312.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107.78 : 3,162.49 = 874.88 : x
  2. Step 2: Convert to fraction form
    2,107.78/3,162.49 = 874.88/x
  3. Step 3: Cross multiply
    2,107.78x = 3,162.49 × 874.88
  4. Step 4: Simplify right side
    2,107.78x = 2,766,781.25
  5. Step 5: Solve for x
    x = 2,766,781.25/2,107.78
  6. Step 6: Final answer
    x = 1,312.65

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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.