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Finding the Fourth Proportional to 509,489.20, 764,039.40 and 154,385.20

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Solution

The fourth proportional to 509,489.20, 764,039.40 and 154,385.20 is: 231,518.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,489.20 : 764,039.40 = 154,385.20 : x
  2. Step 2: Convert to fraction form
    509,489.20/764,039.40 = 154,385.20/x
  3. Step 3: Cross multiply
    509,489.20x = 764,039.40 × 154,385.20
  4. Step 4: Simplify right side
    509,489.20x = 117,956,375,576.88
  5. Step 5: Solve for x
    x = 117,956,375,576.88/509,489.20
  6. Step 6: Final answer
    x = 231,518.89

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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.