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Finding the Fourth Proportional to 15,795.15, 21,789.86 and 9,418.11

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Solution

The fourth proportional to 15,795.15, 21,789.86 and 9,418.11 is: 12,992.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,795.15 : 21,789.86 = 9,418.11 : x
  2. Step 2: Convert to fraction form
    15,795.15/21,789.86 = 9,418.11/x
  3. Step 3: Cross multiply
    15,795.15x = 21,789.86 × 9,418.11
  4. Step 4: Simplify right side
    15,795.15x = 205,219,251.27
  5. Step 5: Solve for x
    x = 205,219,251.27/15,795.15
  6. Step 6: Final answer
    x = 12,992.55

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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.