Home / 28,939.50-39,936.75-15,691.50

Finding the Fourth Proportional to 28,939.50, 39,936.75 and 15,691.50

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Solution

The fourth proportional to 28,939.50, 39,936.75 and 15,691.50 is: 21,654.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,939.50 : 39,936.75 = 15,691.50 : x
  2. Step 2: Convert to fraction form
    28,939.50/39,936.75 = 15,691.50/x
  3. Step 3: Cross multiply
    28,939.50x = 39,936.75 × 15,691.50
  4. Step 4: Simplify right side
    28,939.50x = 626,667,512.63
  5. Step 5: Solve for x
    x = 626,667,512.63/28,939.50
  6. Step 6: Final answer
    x = 21,654.40

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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.