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Finding the Fourth Proportional to 28,268, 39,007.86 and 15,691.76

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Solution

The fourth proportional to 28,268, 39,007.86 and 15,691.76 is: 21,653.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,268 : 39,007.86 = 15,691.76 : x
  2. Step 2: Convert to fraction form
    28,268/39,007.86 = 15,691.76/x
  3. Step 3: Cross multiply
    28,268x = 39,007.86 × 15,691.76
  4. Step 4: Simplify right side
    28,268x = 612,101,977.23
  5. Step 5: Solve for x
    x = 612,101,977.23/28,268
  6. Step 6: Final answer
    x = 21,653.53

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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.