Home / 1,316.78-1,974.39-1,121.87

Finding the Fourth Proportional to 1,316.78, 1,974.39 and 1,121.87

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Solution

The fourth proportional to 1,316.78, 1,974.39 and 1,121.87 is: 1,682.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.78 : 1,974.39 = 1,121.87 : x
  2. Step 2: Convert to fraction form
    1,316.78/1,974.39 = 1,121.87/x
  3. Step 3: Cross multiply
    1,316.78x = 1,974.39 × 1,121.87
  4. Step 4: Simplify right side
    1,316.78x = 2,215,008.91
  5. Step 5: Solve for x
    x = 2,215,008.91/1,316.78
  6. Step 6: Final answer
    x = 1,682.14

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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.