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Finding the Fourth Proportional to 396,640.62, 546,835.29 and 315,240.66

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Solution

The fourth proportional to 396,640.62, 546,835.29 and 315,240.66 is: 434,611.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,640.62 : 546,835.29 = 315,240.66 : x
  2. Step 2: Convert to fraction form
    396,640.62/546,835.29 = 315,240.66/x
  3. Step 3: Cross multiply
    396,640.62x = 546,835.29 × 315,240.66
  4. Step 4: Simplify right side
    396,640.62x = 172,384,717,730.89
  5. Step 5: Solve for x
    x = 172,384,717,730.89/396,640.62
  6. Step 6: Final answer
    x = 434,611.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.