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Finding the Fourth Proportional to 1,278.01, 1,917.30 and 412.31

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Solution

The fourth proportional to 1,278.01, 1,917.30 and 412.31 is: 618.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.01 : 1,917.30 = 412.31 : x
  2. Step 2: Convert to fraction form
    1,278.01/1,917.30 = 412.31/x
  3. Step 3: Cross multiply
    1,278.01x = 1,917.30 × 412.31
  4. Step 4: Simplify right side
    1,278.01x = 790,519.90
  5. Step 5: Solve for x
    x = 790,519.90/1,278.01
  6. Step 6: Final answer
    x = 618.56

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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.