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Finding the Fourth Proportional to 644,334.75, 889,129.90 and 372,420.25

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Solution

The fourth proportional to 644,334.75, 889,129.90 and 372,420.25 is: 513,909.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,334.75 : 889,129.90 = 372,420.25 : x
  2. Step 2: Convert to fraction form
    644,334.75/889,129.90 = 372,420.25/x
  3. Step 3: Cross multiply
    644,334.75x = 889,129.90 × 372,420.25
  4. Step 4: Simplify right side
    644,334.75x = 331,129,979,640.48
  5. Step 5: Solve for x
    x = 331,129,979,640.48/644,334.75
  6. Step 6: Final answer
    x = 513,909.86

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1.5x scale

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.