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Finding the Fourth Proportional to 644,694.86, 889,626.85 and 372,780.36

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Solution

The fourth proportional to 644,694.86, 889,626.85 and 372,780.36 is: 514,406.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,694.86 : 889,626.85 = 372,780.36 : x
  2. Step 2: Convert to fraction form
    644,694.86/889,626.85 = 372,780.36/x
  3. Step 3: Cross multiply
    644,694.86x = 889,626.85 × 372,780.36
  4. Step 4: Simplify right side
    644,694.86x = 331,635,416,476.72
  5. Step 5: Solve for x
    x = 331,635,416,476.72/644,694.86
  6. Step 6: Final answer
    x = 514,406.79

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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.