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Finding the Fourth Proportional to 644,395.17, 889,166.49 and 372,410.55

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Solution

The fourth proportional to 644,395.17, 889,166.49 and 372,410.55 is: 513,869.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,395.17 : 889,166.49 = 372,410.55 : x
  2. Step 2: Convert to fraction form
    644,395.17/889,166.49 = 372,410.55/x
  3. Step 3: Cross multiply
    644,395.17x = 889,166.49 × 372,410.55
  4. Step 4: Simplify right side
    644,395.17x = 331,134,981,582.47
  5. Step 5: Solve for x
    x = 331,134,981,582.47/644,395.17
  6. Step 6: Final answer
    x = 513,869.43

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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.