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Finding the Fourth Proportional to 279,780, 386,155.88 and 165,015.73

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Solution

The fourth proportional to 279,780, 386,155.88 and 165,015.73 is: 227,756.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,780 : 386,155.88 = 165,015.73 : x
  2. Step 2: Convert to fraction form
    279,780/386,155.88 = 165,015.73/x
  3. Step 3: Cross multiply
    279,780x = 386,155.88 × 165,015.73
  4. Step 4: Simplify right side
    279,780x = 63,721,794,431.99
  5. Step 5: Solve for x
    x = 63,721,794,431.99/279,780
  6. Step 6: Final answer
    x = 227,756.79

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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.