Home / 1,212.78-1,685.49-1,199.82

Finding the Fourth Proportional to 1,212.78, 1,685.49 and 1,199.82

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Solution

The fourth proportional to 1,212.78, 1,685.49 and 1,199.82 is: 1,667.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.78 : 1,685.49 = 1,199.82 : x
  2. Step 2: Convert to fraction form
    1,212.78/1,685.49 = 1,199.82/x
  3. Step 3: Cross multiply
    1,212.78x = 1,685.49 × 1,199.82
  4. Step 4: Simplify right side
    1,212.78x = 2,022,284.61
  5. Step 5: Solve for x
    x = 2,022,284.61/1,212.78
  6. Step 6: Final answer
    x = 1,667.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.