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Finding the Fourth Proportional to 21,327.75, 31,991.63 and 7,476.75

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Solution

The fourth proportional to 21,327.75, 31,991.63 and 7,476.75 is: 11,215.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,327.75 : 31,991.63 = 7,476.75 : x
  2. Step 2: Convert to fraction form
    21,327.75/31,991.63 = 7,476.75/x
  3. Step 3: Cross multiply
    21,327.75x = 31,991.63 × 7,476.75
  4. Step 4: Simplify right side
    21,327.75x = 239,193,382.22
  5. Step 5: Solve for x
    x = 239,193,382.22/21,327.75
  6. Step 6: Final answer
    x = 11,215.13

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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.