Home / 1,239.30-1,709.37-1,083.78

Finding the Fourth Proportional to 1,239.30, 1,709.37 and 1,083.78

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Solution

The fourth proportional to 1,239.30, 1,709.37 and 1,083.78 is: 1,494.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.30 : 1,709.37 = 1,083.78 : x
  2. Step 2: Convert to fraction form
    1,239.30/1,709.37 = 1,083.78/x
  3. Step 3: Cross multiply
    1,239.30x = 1,709.37 × 1,083.78
  4. Step 4: Simplify right side
    1,239.30x = 1,852,581.02
  5. Step 5: Solve for x
    x = 1,852,581.02/1,239.30
  6. Step 6: Final answer
    x = 1,494.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.