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Finding the Fourth Proportional to 28,392, 39,180.96 and 15,817.56

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Solution

The fourth proportional to 28,392, 39,180.96 and 15,817.56 is: 21,828.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,392 : 39,180.96 = 15,817.56 : x
  2. Step 2: Convert to fraction form
    28,392/39,180.96 = 15,817.56/x
  3. Step 3: Cross multiply
    28,392x = 39,180.96 × 15,817.56
  4. Step 4: Simplify right side
    28,392x = 619,747,185.66
  5. Step 5: Solve for x
    x = 619,747,185.66/28,392
  6. Step 6: Final answer
    x = 21,828.23

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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.