Home / 21,319.45-31,960.94-8,181.25

Finding the Fourth Proportional to 21,319.45, 31,960.94 and 8,181.25

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Solution

The fourth proportional to 21,319.45, 31,960.94 and 8,181.25 is: 12,264.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.45 : 31,960.94 = 8,181.25 : x
  2. Step 2: Convert to fraction form
    21,319.45/31,960.94 = 8,181.25/x
  3. Step 3: Cross multiply
    21,319.45x = 31,960.94 × 8,181.25
  4. Step 4: Simplify right side
    21,319.45x = 261,480,440.38
  5. Step 5: Solve for x
    x = 261,480,440.38/21,319.45
  6. Step 6: Final answer
    x = 12,264.88

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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.