Home / 1,278.11-1,917.23-412.43

Finding the Fourth Proportional to 1,278.11, 1,917.23 and 412.43

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Solution

The fourth proportional to 1,278.11, 1,917.23 and 412.43 is: 618.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.11 : 1,917.23 = 412.43 : x
  2. Step 2: Convert to fraction form
    1,278.11/1,917.23 = 412.43/x
  3. Step 3: Cross multiply
    1,278.11x = 1,917.23 × 412.43
  4. Step 4: Simplify right side
    1,278.11x = 790,723.17
  5. Step 5: Solve for x
    x = 790,723.17/1,278.11
  6. Step 6: Final answer
    x = 618.67

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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.