Home / 339,905.60-509,399.12-129,428.72

Finding the Fourth Proportional to 339,905.60, 509,399.12 and 129,428.72

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Solution

The fourth proportional to 339,905.60, 509,399.12 and 129,428.72 is: 193,968.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,905.60 : 509,399.12 = 129,428.72 : x
  2. Step 2: Convert to fraction form
    339,905.60/509,399.12 = 129,428.72/x
  3. Step 3: Cross multiply
    339,905.60x = 509,399.12 × 129,428.72
  4. Step 4: Simplify right side
    339,905.60x = 65,930,876,070.73
  5. Step 5: Solve for x
    x = 65,930,876,070.73/339,905.60
  6. Step 6: Final answer
    x = 193,968.20

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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.