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Finding the Fourth Proportional to 644,335.50, 889,130.94 and 372,421

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Solution

The fourth proportional to 644,335.50, 889,130.94 and 372,421 is: 513,910.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,335.50 : 889,130.94 = 372,421 : x
  2. Step 2: Convert to fraction form
    644,335.50/889,130.94 = 372,421/x
  3. Step 3: Cross multiply
    644,335.50x = 889,130.94 × 372,421
  4. Step 4: Simplify right side
    644,335.50x = 331,131,033,805.74
  5. Step 5: Solve for x
    x = 331,131,033,805.74/644,335.50
  6. Step 6: Final answer
    x = 513,910.90

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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.