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Finding the Fourth Proportional to 644,334.01, 889,128.87 and 372,419.50

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Solution

The fourth proportional to 644,334.01, 889,128.87 and 372,419.50 is: 513,908.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,334.01 : 889,128.87 = 372,419.50 : x
  2. Step 2: Convert to fraction form
    644,334.01/889,128.87 = 372,419.50/x
  3. Step 3: Cross multiply
    644,334.01x = 889,128.87 × 372,419.50
  4. Step 4: Simplify right side
    644,334.01x = 331,128,929,200.97
  5. Step 5: Solve for x
    x = 331,128,929,200.97/644,334.01
  6. Step 6: Final answer
    x = 513,908.82

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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.