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Finding the Fourth Proportional to 21,299.91, 31,921.92 and 9,449.61

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Solution

The fourth proportional to 21,299.91, 31,921.92 and 9,449.61 is: 14,162.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,299.91 : 31,921.92 = 9,449.61 : x
  2. Step 2: Convert to fraction form
    21,299.91/31,921.92 = 9,449.61/x
  3. Step 3: Cross multiply
    21,299.91x = 31,921.92 × 9,449.61
  4. Step 4: Simplify right side
    21,299.91x = 301,649,694.45
  5. Step 5: Solve for x
    x = 301,649,694.45/21,299.91
  6. Step 6: Final answer
    x = 14,162.02

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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.