Home / 1,285.97-1,919.10-1,147.55

Finding the Fourth Proportional to 1,285.97, 1,919.10 and 1,147.55

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Solution

The fourth proportional to 1,285.97, 1,919.10 and 1,147.55 is: 1,712.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.97 : 1,919.10 = 1,147.55 : x
  2. Step 2: Convert to fraction form
    1,285.97/1,919.10 = 1,147.55/x
  3. Step 3: Cross multiply
    1,285.97x = 1,919.10 × 1,147.55
  4. Step 4: Simplify right side
    1,285.97x = 2,202,257.47
  5. Step 5: Solve for x
    x = 2,202,257.47/1,285.97
  6. Step 6: Final answer
    x = 1,712.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.