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Finding the Fourth Proportional to 278,788.44, 418,119.54 and 128,946.48

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Solution

The fourth proportional to 278,788.44, 418,119.54 and 128,946.48 is: 193,390.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,788.44 : 418,119.54 = 128,946.48 : x
  2. Step 2: Convert to fraction form
    278,788.44/418,119.54 = 128,946.48/x
  3. Step 3: Cross multiply
    278,788.44x = 418,119.54 × 128,946.48
  4. Step 4: Simplify right side
    278,788.44x = 53,915,042,902.22
  5. Step 5: Solve for x
    x = 53,915,042,902.22/278,788.44
  6. Step 6: Final answer
    x = 193,390.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.