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Finding the Fourth Proportional to 310,253.92, 428,190 and 189,369.34

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Solution

The fourth proportional to 310,253.92, 428,190 and 189,369.34 is: 261,353.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,253.92 : 428,190 = 189,369.34 : x
  2. Step 2: Convert to fraction form
    310,253.92/428,190 = 189,369.34/x
  3. Step 3: Cross multiply
    310,253.92x = 428,190 × 189,369.34
  4. Step 4: Simplify right side
    310,253.92x = 81,086,057,694.60
  5. Step 5: Solve for x
    x = 81,086,057,694.60/310,253.92
  6. Step 6: Final answer
    x = 261,353.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.