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Finding the Fourth Proportional to 21,687.25, 29,928.45 and 11,751.25

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Solution

The fourth proportional to 21,687.25, 29,928.45 and 11,751.25 is: 16,216.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.25 : 29,928.45 = 11,751.25 : x
  2. Step 2: Convert to fraction form
    21,687.25/29,928.45 = 11,751.25/x
  3. Step 3: Cross multiply
    21,687.25x = 29,928.45 × 11,751.25
  4. Step 4: Simplify right side
    21,687.25x = 351,696,698.06
  5. Step 5: Solve for x
    x = 351,696,698.06/21,687.25
  6. Step 6: Final answer
    x = 16,216.75

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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.