Home / 5,139.20-7,708.80-1,243.61

Finding the Fourth Proportional to 5,139.20, 7,708.80 and 1,243.61

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Solution

The fourth proportional to 5,139.20, 7,708.80 and 1,243.61 is: 1,865.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,139.20 : 7,708.80 = 1,243.61 : x
  2. Step 2: Convert to fraction form
    5,139.20/7,708.80 = 1,243.61/x
  3. Step 3: Cross multiply
    5,139.20x = 7,708.80 × 1,243.61
  4. Step 4: Simplify right side
    5,139.20x = 9,586,702.22
  5. Step 5: Solve for x
    x = 9,586,702.22/5,139.20
  6. Step 6: Final answer
    x = 1,865.41

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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.