Home / 1,243.90-1,865.31-378.04

Finding the Fourth Proportional to 1,243.90, 1,865.31 and 378.04

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Solution

The fourth proportional to 1,243.90, 1,865.31 and 378.04 is: 566.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.90 : 1,865.31 = 378.04 : x
  2. Step 2: Convert to fraction form
    1,243.90/1,865.31 = 378.04/x
  3. Step 3: Cross multiply
    1,243.90x = 1,865.31 × 378.04
  4. Step 4: Simplify right side
    1,243.90x = 705,161.79
  5. Step 5: Solve for x
    x = 705,161.79/1,243.90
  6. Step 6: Final answer
    x = 566.90

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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.