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Finding the Fourth Proportional to 339,672.40, 509,513.44 and 129,321.84

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Solution

The fourth proportional to 339,672.40, 509,513.44 and 129,321.84 is: 193,984.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,672.40 : 509,513.44 = 129,321.84 : x
  2. Step 2: Convert to fraction form
    339,672.40/509,513.44 = 129,321.84/x
  3. Step 3: Cross multiply
    339,672.40x = 509,513.44 × 129,321.84
  4. Step 4: Simplify right side
    339,672.40x = 65,891,215,565.53
  5. Step 5: Solve for x
    x = 65,891,215,565.53/339,672.40
  6. Step 6: Final answer
    x = 193,984.60

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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.