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Finding the Fourth Proportional to 339,747.20, 509,620.80 and 261,257.60

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Solution

The fourth proportional to 339,747.20, 509,620.80 and 261,257.60 is: 391,886.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,747.20 : 509,620.80 = 261,257.60 : x
  2. Step 2: Convert to fraction form
    339,747.20/509,620.80 = 261,257.60/x
  3. Step 3: Cross multiply
    339,747.20x = 509,620.80 × 261,257.60
  4. Step 4: Simplify right side
    339,747.20x = 133,142,307,118.08
  5. Step 5: Solve for x
    x = 133,142,307,118.08/339,747.20
  6. Step 6: Final answer
    x = 391,886.40

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1.5x scale

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.