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Finding the Fourth Proportional to 256,979.70, 385,469.55 and 69,991.20

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Solution

The fourth proportional to 256,979.70, 385,469.55 and 69,991.20 is: 104,986.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,979.70 : 385,469.55 = 69,991.20 : x
  2. Step 2: Convert to fraction form
    256,979.70/385,469.55 = 69,991.20/x
  3. Step 3: Cross multiply
    256,979.70x = 385,469.55 × 69,991.20
  4. Step 4: Simplify right side
    256,979.70x = 26,979,476,367.96
  5. Step 5: Solve for x
    x = 26,979,476,367.96/256,979.70
  6. Step 6: Final answer
    x = 104,986.80

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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.