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Finding the Fourth Proportional to 256,979.70, 385,493.85 and 69,991.20

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Solution

The fourth proportional to 256,979.70, 385,493.85 and 69,991.20 is: 104,993.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,979.70 : 385,493.85 = 69,991.20 : x
  2. Step 2: Convert to fraction form
    256,979.70/385,493.85 = 69,991.20/x
  3. Step 3: Cross multiply
    256,979.70x = 385,493.85 × 69,991.20
  4. Step 4: Simplify right side
    256,979.70x = 26,981,177,154.12
  5. Step 5: Solve for x
    x = 26,981,177,154.12/256,979.70
  6. Step 6: Final answer
    x = 104,993.42

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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.