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Finding the Fourth Proportional to 28,969.88, 39,978.43 and 15,721.88

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Solution

The fourth proportional to 28,969.88, 39,978.43 and 15,721.88 is: 21,696.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,969.88 : 39,978.43 = 15,721.88 : x
  2. Step 2: Convert to fraction form
    28,969.88/39,978.43 = 15,721.88/x
  3. Step 3: Cross multiply
    28,969.88x = 39,978.43 × 15,721.88
  4. Step 4: Simplify right side
    28,969.88x = 628,536,079.05
  5. Step 5: Solve for x
    x = 628,536,079.05/28,969.88
  6. Step 6: Final answer
    x = 21,696.19

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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.