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Finding the Fourth Proportional to 644,335.75, 889,131.28 and 372,421.25

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Solution

The fourth proportional to 644,335.75, 889,131.28 and 372,421.25 is: 513,911.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,335.75 : 889,131.28 = 372,421.25 : x
  2. Step 2: Convert to fraction form
    644,335.75/889,131.28 = 372,421.25/x
  3. Step 3: Cross multiply
    644,335.75x = 889,131.28 × 372,421.25
  4. Step 4: Simplify right side
    644,335.75x = 331,131,382,711.70
  5. Step 5: Solve for x
    x = 331,131,382,711.70/644,335.75
  6. Step 6: Final answer
    x = 513,911.24

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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.