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Finding the Fourth Proportional to 203,693.20, 305,612.70 and 85,400.80

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Solution

The fourth proportional to 203,693.20, 305,612.70 and 85,400.80 is: 128,131.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,693.20 : 305,612.70 = 85,400.80 : x
  2. Step 2: Convert to fraction form
    203,693.20/305,612.70 = 85,400.80/x
  3. Step 3: Cross multiply
    203,693.20x = 305,612.70 × 85,400.80
  4. Step 4: Simplify right side
    203,693.20x = 26,099,569,070.16
  5. Step 5: Solve for x
    x = 26,099,569,070.16/203,693.20
  6. Step 6: Final answer
    x = 128,131.76

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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.