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Finding the Fourth Proportional to 509,929.20, 764,861.40 and 172,969.20

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Solution

The fourth proportional to 509,929.20, 764,861.40 and 172,969.20 is: 259,442.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,929.20 : 764,861.40 = 172,969.20 : x
  2. Step 2: Convert to fraction form
    509,929.20/764,861.40 = 172,969.20/x
  3. Step 3: Cross multiply
    509,929.20x = 764,861.40 × 172,969.20
  4. Step 4: Simplify right side
    509,929.20x = 132,297,464,468.88
  5. Step 5: Solve for x
    x = 132,297,464,468.88/509,929.20
  6. Step 6: Final answer
    x = 259,442.81

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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.