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Finding the Fourth Proportional to 339,855.30, 509,781.15 and 87,135.30

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Solution

The fourth proportional to 339,855.30, 509,781.15 and 87,135.30 is: 130,702.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,855.30 : 509,781.15 = 87,135.30 : x
  2. Step 2: Convert to fraction form
    339,855.30/509,781.15 = 87,135.30/x
  3. Step 3: Cross multiply
    339,855.30x = 509,781.15 × 87,135.30
  4. Step 4: Simplify right side
    339,855.30x = 44,419,933,439.60
  5. Step 5: Solve for x
    x = 44,419,933,439.60/339,855.30
  6. Step 6: Final answer
    x = 130,702.49

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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.