Home / 1,202.78-1,811.89-1,187.66

Finding the Fourth Proportional to 1,202.78, 1,811.89 and 1,187.66

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Solution

The fourth proportional to 1,202.78, 1,811.89 and 1,187.66 is: 1,789.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.78 : 1,811.89 = 1,187.66 : x
  2. Step 2: Convert to fraction form
    1,202.78/1,811.89 = 1,187.66/x
  3. Step 3: Cross multiply
    1,202.78x = 1,811.89 × 1,187.66
  4. Step 4: Simplify right side
    1,202.78x = 2,151,903.34
  5. Step 5: Solve for x
    x = 2,151,903.34/1,202.78
  6. Step 6: Final answer
    x = 1,789.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.