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Finding the Fourth Proportional to 715,738.86, 987,722.82 and 393,469.68

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Solution

The fourth proportional to 715,738.86, 987,722.82 and 393,469.68 is: 542,989.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,738.86 : 987,722.82 = 393,469.68 : x
  2. Step 2: Convert to fraction form
    715,738.86/987,722.82 = 393,469.68/x
  3. Step 3: Cross multiply
    715,738.86x = 987,722.82 × 393,469.68
  4. Step 4: Simplify right side
    715,738.86x = 388,638,981,914.10
  5. Step 5: Solve for x
    x = 388,638,981,914.10/715,738.86
  6. Step 6: Final answer
    x = 542,989.91

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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.