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Finding the Fourth Proportional to 21,229.75, 31,859.25 and 7,378.75

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Solution

The fourth proportional to 21,229.75, 31,859.25 and 7,378.75 is: 11,073.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,229.75 : 31,859.25 = 7,378.75 : x
  2. Step 2: Convert to fraction form
    21,229.75/31,859.25 = 7,378.75/x
  3. Step 3: Cross multiply
    21,229.75x = 31,859.25 × 7,378.75
  4. Step 4: Simplify right side
    21,229.75x = 235,081,440.94
  5. Step 5: Solve for x
    x = 235,081,440.94/21,229.75
  6. Step 6: Final answer
    x = 11,073.21

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1.5x scale

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.