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Finding the Fourth Proportional to 621,418.86, 931,481.91 and 421,755.48

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Solution

The fourth proportional to 621,418.86, 931,481.91 and 421,755.48 is: 632,194.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,418.86 : 931,481.91 = 421,755.48 : x
  2. Step 2: Convert to fraction form
    621,418.86/931,481.91 = 421,755.48/x
  3. Step 3: Cross multiply
    621,418.86x = 931,481.91 × 421,755.48
  4. Step 4: Simplify right side
    621,418.86x = 392,857,600,063.37
  5. Step 5: Solve for x
    x = 392,857,600,063.37/621,418.86
  6. Step 6: Final answer
    x = 632,194.52

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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.