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Finding the Fourth Proportional to 509,317.20, 764,321.40 and 331,390.80

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Solution

The fourth proportional to 509,317.20, 764,321.40 and 331,390.80 is: 497,311.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,317.20 : 764,321.40 = 331,390.80 : x
  2. Step 2: Convert to fraction form
    509,317.20/764,321.40 = 331,390.80/x
  3. Step 3: Cross multiply
    509,317.20x = 764,321.40 × 331,390.80
  4. Step 4: Simplify right side
    509,317.20x = 253,289,080,203.12
  5. Step 5: Solve for x
    x = 253,289,080,203.12/509,317.20
  6. Step 6: Final answer
    x = 497,311.07

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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.