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Finding the Fourth Proportional to 394,610.80, 591,916.20 and 145,260.40

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Solution

The fourth proportional to 394,610.80, 591,916.20 and 145,260.40 is: 217,890.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,610.80 : 591,916.20 = 145,260.40 : x
  2. Step 2: Convert to fraction form
    394,610.80/591,916.20 = 145,260.40/x
  3. Step 3: Cross multiply
    394,610.80x = 591,916.20 × 145,260.40
  4. Step 4: Simplify right side
    394,610.80x = 85,981,983,978.48
  5. Step 5: Solve for x
    x = 85,981,983,978.48/394,610.80
  6. Step 6: Final answer
    x = 217,890.60

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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.