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Finding the Fourth Proportional to 256,738.60, 385,107.90 and 79,229.80

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Solution

The fourth proportional to 256,738.60, 385,107.90 and 79,229.80 is: 118,844.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,738.60 : 385,107.90 = 79,229.80 : x
  2. Step 2: Convert to fraction form
    256,738.60/385,107.90 = 79,229.80/x
  3. Step 3: Cross multiply
    256,738.60x = 385,107.90 × 79,229.80
  4. Step 4: Simplify right side
    256,738.60x = 30,512,021,895.42
  5. Step 5: Solve for x
    x = 30,512,021,895.42/256,738.60
  6. Step 6: Final answer
    x = 118,844.70

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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.