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Finding the Fourth Proportional to 279,243.78, 385,351.05 and 155,060.52

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Solution

The fourth proportional to 279,243.78, 385,351.05 and 155,060.52 is: 213,980.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,243.78 : 385,351.05 = 155,060.52 : x
  2. Step 2: Convert to fraction form
    279,243.78/385,351.05 = 155,060.52/x
  3. Step 3: Cross multiply
    279,243.78x = 385,351.05 × 155,060.52
  4. Step 4: Simplify right side
    279,243.78x = 59,752,734,195.55
  5. Step 5: Solve for x
    x = 59,752,734,195.55/279,243.78
  6. Step 6: Final answer
    x = 213,980.54

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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.