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Finding the Fourth Proportional to 203,928.60, 305,892.90 and 85,830.60

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Solution

The fourth proportional to 203,928.60, 305,892.90 and 85,830.60 is: 128,745.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,928.60 : 305,892.90 = 85,830.60 : x
  2. Step 2: Convert to fraction form
    203,928.60/305,892.90 = 85,830.60/x
  3. Step 3: Cross multiply
    203,928.60x = 305,892.90 × 85,830.60
  4. Step 4: Simplify right side
    203,928.60x = 26,254,971,142.74
  5. Step 5: Solve for x
    x = 26,254,971,142.74/203,928.60
  6. Step 6: Final answer
    x = 128,745.90

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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.