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Finding the Fourth Proportional to 239,788.80, 330,791.04 and 154,978.56

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Solution

The fourth proportional to 239,788.80, 330,791.04 and 154,978.56 is: 213,794.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,788.80 : 330,791.04 = 154,978.56 : x
  2. Step 2: Convert to fraction form
    239,788.80/330,791.04 = 154,978.56/x
  3. Step 3: Cross multiply
    239,788.80x = 330,791.04 × 154,978.56
  4. Step 4: Simplify right side
    239,788.80x = 51,265,519,040.10
  5. Step 5: Solve for x
    x = 51,265,519,040.10/239,788.80
  6. Step 6: Final answer
    x = 213,794.47

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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.