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Finding the Fourth Proportional to 391,059.20, 586,351.20 and 154,128.80

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Solution

The fourth proportional to 391,059.20, 586,351.20 and 154,128.80 is: 231,099.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,059.20 : 586,351.20 = 154,128.80 : x
  2. Step 2: Convert to fraction form
    391,059.20/586,351.20 = 154,128.80/x
  3. Step 3: Cross multiply
    391,059.20x = 586,351.20 × 154,128.80
  4. Step 4: Simplify right side
    391,059.20x = 90,373,606,834.56
  5. Step 5: Solve for x
    x = 90,373,606,834.56/391,059.20
  6. Step 6: Final answer
    x = 231,099.55

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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.