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Finding the Fourth Proportional to 391,410.20, 587,115.30 and 256,107.80

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Solution

The fourth proportional to 391,410.20, 587,115.30 and 256,107.80 is: 384,161.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,410.20 : 587,115.30 = 256,107.80 : x
  2. Step 2: Convert to fraction form
    391,410.20/587,115.30 = 256,107.80/x
  3. Step 3: Cross multiply
    391,410.20x = 587,115.30 × 256,107.80
  4. Step 4: Simplify right side
    391,410.20x = 150,364,807,829.34
  5. Step 5: Solve for x
    x = 150,364,807,829.34/391,410.20
  6. Step 6: Final answer
    x = 384,161.70

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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.