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Finding the Fourth Proportional to 1,278.27, 1,917.27 and 412.38

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Solution

The fourth proportional to 1,278.27, 1,917.27 and 412.38 is: 618.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.27 : 1,917.27 = 412.38 : x
  2. Step 2: Convert to fraction form
    1,278.27/1,917.27 = 412.38/x
  3. Step 3: Cross multiply
    1,278.27x = 1,917.27 × 412.38
  4. Step 4: Simplify right side
    1,278.27x = 790,643.80
  5. Step 5: Solve for x
    x = 790,643.80/1,278.27
  6. Step 6: Final answer
    x = 618.53

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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.