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Finding the Fourth Proportional to 339,354.81, 509,097.78 and 128,976.35

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Solution

The fourth proportional to 339,354.81, 509,097.78 and 128,976.35 is: 193,489.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,354.81 : 509,097.78 = 128,976.35 : x
  2. Step 2: Convert to fraction form
    339,354.81/509,097.78 = 128,976.35/x
  3. Step 3: Cross multiply
    339,354.81x = 509,097.78 × 128,976.35
  4. Step 4: Simplify right side
    339,354.81x = 65,661,570,912.01
  5. Step 5: Solve for x
    x = 65,661,570,912.01/339,354.81
  6. Step 6: Final answer
    x = 193,489.44

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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.