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Finding the Fourth Proportional to 644,313.21, 889,045.47 and 372,406.47

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Solution

The fourth proportional to 644,313.21, 889,045.47 and 372,406.47 is: 513,859.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,313.21 : 889,045.47 = 372,406.47 : x
  2. Step 2: Convert to fraction form
    644,313.21/889,045.47 = 372,406.47/x
  3. Step 3: Cross multiply
    644,313.21x = 889,045.47 × 372,406.47
  4. Step 4: Simplify right side
    644,313.21x = 331,086,285,152.19
  5. Step 5: Solve for x
    x = 331,086,285,152.19/644,313.21
  6. Step 6: Final answer
    x = 513,859.22

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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.