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Finding the Fourth Proportional to 278,992.88, 385,012.68 and 151,668.72

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Solution

The fourth proportional to 278,992.88, 385,012.68 and 151,668.72 is: 209,304.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,992.88 : 385,012.68 = 151,668.72 : x
  2. Step 2: Convert to fraction form
    278,992.88/385,012.68 = 151,668.72/x
  3. Step 3: Cross multiply
    278,992.88x = 385,012.68 × 151,668.72
  4. Step 4: Simplify right side
    278,992.88x = 58,394,380,359.37
  5. Step 5: Solve for x
    x = 58,394,380,359.37/278,992.88
  6. Step 6: Final answer
    x = 209,304.20

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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.