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Finding the Fourth Proportional to 203,939.60, 305,909.40 and 85,841.60

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Solution

The fourth proportional to 203,939.60, 305,909.40 and 85,841.60 is: 128,762.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,939.60 : 305,909.40 = 85,841.60 : x
  2. Step 2: Convert to fraction form
    203,939.60/305,909.40 = 85,841.60/x
  3. Step 3: Cross multiply
    203,939.60x = 305,909.40 × 85,841.60
  4. Step 4: Simplify right side
    203,939.60x = 26,259,752,351.04
  5. Step 5: Solve for x
    x = 26,259,752,351.04/203,939.60
  6. Step 6: Final answer
    x = 128,762.40

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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.