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Finding the Fourth Proportional to 203,855.20, 305,928.60 and 85,611.40

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Solution

The fourth proportional to 203,855.20, 305,928.60 and 85,611.40 is: 128,478.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,855.20 : 305,928.60 = 85,611.40 : x
  2. Step 2: Convert to fraction form
    203,855.20/305,928.60 = 85,611.40/x
  3. Step 3: Cross multiply
    203,855.20x = 305,928.60 × 85,611.40
  4. Step 4: Simplify right side
    203,855.20x = 26,190,975,746.04
  5. Step 5: Solve for x
    x = 26,190,975,746.04/203,855.20
  6. Step 6: Final answer
    x = 128,478.33

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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.