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Finding the Fourth Proportional to 339,906.79, 509,400.87 and 129,429.91

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Solution

The fourth proportional to 339,906.79, 509,400.87 and 129,429.91 is: 193,969.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,906.79 : 509,400.87 = 129,429.91 : x
  2. Step 2: Convert to fraction form
    339,906.79/509,400.87 = 129,429.91/x
  3. Step 3: Cross multiply
    339,906.79x = 509,400.87 × 129,429.91
  4. Step 4: Simplify right side
    339,906.79x = 65,931,708,758.02
  5. Step 5: Solve for x
    x = 65,931,708,758.02/339,906.79
  6. Step 6: Final answer
    x = 193,969.97

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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.