Home / 6,431.40-9,640.38-3,139.96

Finding the Fourth Proportional to 6,431.40, 9,640.38 and 3,139.96

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Solution

The fourth proportional to 6,431.40, 9,640.38 and 3,139.96 is: 4,706.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,431.40 : 9,640.38 = 3,139.96 : x
  2. Step 2: Convert to fraction form
    6,431.40/9,640.38 = 3,139.96/x
  3. Step 3: Cross multiply
    6,431.40x = 9,640.38 × 3,139.96
  4. Step 4: Simplify right side
    6,431.40x = 30,270,407.58
  5. Step 5: Solve for x
    x = 30,270,407.58/6,431.40
  6. Step 6: Final answer
    x = 4,706.66

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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.