Home / 7,129.10-10,689.80-3,231.38

Finding the Fourth Proportional to 7,129.10, 10,689.80 and 3,231.38

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Solution

The fourth proportional to 7,129.10, 10,689.80 and 3,231.38 is: 4,845.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.10 : 10,689.80 = 3,231.38 : x
  2. Step 2: Convert to fraction form
    7,129.10/10,689.80 = 3,231.38/x
  3. Step 3: Cross multiply
    7,129.10x = 10,689.80 × 3,231.38
  4. Step 4: Simplify right side
    7,129.10x = 34,542,736.32
  5. Step 5: Solve for x
    x = 34,542,736.32/7,129.10
  6. Step 6: Final answer
    x = 4,845.32

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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.