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Finding the Fourth Proportional to 21,917.25, 30,245.81 and 11,981.25

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Solution

The fourth proportional to 21,917.25, 30,245.81 and 11,981.25 is: 16,534.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,917.25 : 30,245.81 = 11,981.25 : x
  2. Step 2: Convert to fraction form
    21,917.25/30,245.81 = 11,981.25/x
  3. Step 3: Cross multiply
    21,917.25x = 30,245.81 × 11,981.25
  4. Step 4: Simplify right side
    21,917.25x = 362,382,551.16
  5. Step 5: Solve for x
    x = 362,382,551.16/21,917.25
  6. Step 6: Final answer
    x = 16,534.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.