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Finding the Fourth Proportional to 324,139.20, 485,431.20 and 261,931.20

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Solution

The fourth proportional to 324,139.20, 485,431.20 and 261,931.20 is: 392,268.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    324,139.20 : 485,431.20 = 261,931.20 : x
  2. Step 2: Convert to fraction form
    324,139.20/485,431.20 = 261,931.20/x
  3. Step 3: Cross multiply
    324,139.20x = 485,431.20 × 261,931.20
  4. Step 4: Simplify right side
    324,139.20x = 127,149,576,733.44
  5. Step 5: Solve for x
    x = 127,149,576,733.44/324,139.20
  6. Step 6: Final answer
    x = 392,268.44

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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.