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Finding the Fourth Proportional to 339,666.21, 509,586.80 and 129,189.33

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Solution

The fourth proportional to 339,666.21, 509,586.80 and 129,189.33 is: 193,817.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,666.21 : 509,586.80 = 129,189.33 : x
  2. Step 2: Convert to fraction form
    339,666.21/509,586.80 = 129,189.33/x
  3. Step 3: Cross multiply
    339,666.21x = 509,586.80 × 129,189.33
  4. Step 4: Simplify right side
    339,666.21x = 65,833,176,622.90
  5. Step 5: Solve for x
    x = 65,833,176,622.90/339,666.21
  6. Step 6: Final answer
    x = 193,817.27

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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.