Home / 21,282.75-31,930.20-7,245.86

Finding the Fourth Proportional to 21,282.75, 31,930.20 and 7,245.86

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Solution

The fourth proportional to 21,282.75, 31,930.20 and 7,245.86 is: 10,870.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,282.75 : 31,930.20 = 7,245.86 : x
  2. Step 2: Convert to fraction form
    21,282.75/31,930.20 = 7,245.86/x
  3. Step 3: Cross multiply
    21,282.75x = 31,930.20 × 7,245.86
  4. Step 4: Simplify right side
    21,282.75x = 231,361,599.32
  5. Step 5: Solve for x
    x = 231,361,599.32/21,282.75
  6. Step 6: Final answer
    x = 10,870.85

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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.