Home / 21,155.75-31,734.15-7,115.96

Finding the Fourth Proportional to 21,155.75, 31,734.15 and 7,115.96

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Solution

The fourth proportional to 21,155.75, 31,734.15 and 7,115.96 is: 10,674.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,155.75 : 31,734.15 = 7,115.96 : x
  2. Step 2: Convert to fraction form
    21,155.75/31,734.15 = 7,115.96/x
  3. Step 3: Cross multiply
    21,155.75x = 31,734.15 × 7,115.96
  4. Step 4: Simplify right side
    21,155.75x = 225,818,942.03
  5. Step 5: Solve for x
    x = 225,818,942.03/21,155.75
  6. Step 6: Final answer
    x = 10,674.12

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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.