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Finding the Fourth Proportional to 644,392.49, 889,162.78 and 372,407.86

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Solution

The fourth proportional to 644,392.49, 889,162.78 and 372,407.86 is: 513,865.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,392.49 : 889,162.78 = 372,407.86 : x
  2. Step 2: Convert to fraction form
    644,392.49/889,162.78 = 372,407.86/x
  3. Step 3: Cross multiply
    644,392.49x = 889,162.78 × 372,407.86
  4. Step 4: Simplify right side
    644,392.49x = 331,131,201,783.60
  5. Step 5: Solve for x
    x = 331,131,201,783.60/644,392.49
  6. Step 6: Final answer
    x = 513,865.71

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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.