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Finding the Fourth Proportional to 135,909.30, 203,863.95 and 85,389.60

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Solution

The fourth proportional to 135,909.30, 203,863.95 and 85,389.60 is: 128,084.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,909.30 : 203,863.95 = 85,389.60 : x
  2. Step 2: Convert to fraction form
    135,909.30/203,863.95 = 85,389.60/x
  3. Step 3: Cross multiply
    135,909.30x = 203,863.95 × 85,389.60
  4. Step 4: Simplify right side
    135,909.30x = 17,407,861,144.92
  5. Step 5: Solve for x
    x = 17,407,861,144.92/135,909.30
  6. Step 6: Final answer
    x = 128,084.40

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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.