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Finding the Fourth Proportional to 640,755.38, 960,658.50 and 387,976.44

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Solution

The fourth proportional to 640,755.38, 960,658.50 and 387,976.44 is: 581,677.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,755.38 : 960,658.50 = 387,976.44 : x
  2. Step 2: Convert to fraction form
    640,755.38/960,658.50 = 387,976.44/x
  3. Step 3: Cross multiply
    640,755.38x = 960,658.50 × 387,976.44
  4. Step 4: Simplify right side
    640,755.38x = 372,712,864,885.74
  5. Step 5: Solve for x
    x = 372,712,864,885.74/640,755.38
  6. Step 6: Final answer
    x = 581,677.31

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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.