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Finding the Fourth Proportional to 378,221.20, 567,331.80 and 211,987.60

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Solution

The fourth proportional to 378,221.20, 567,331.80 and 211,987.60 is: 317,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,221.20 : 567,331.80 = 211,987.60 : x
  2. Step 2: Convert to fraction form
    378,221.20/567,331.80 = 211,987.60/x
  3. Step 3: Cross multiply
    378,221.20x = 567,331.80 × 211,987.60
  4. Step 4: Simplify right side
    378,221.20x = 120,267,306,685.68
  5. Step 5: Solve for x
    x = 120,267,306,685.68/378,221.20
  6. Step 6: Final answer
    x = 317,981.40

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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.