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Finding the Fourth Proportional to 644,342.48, 889,140.60 and 372,428

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Solution

The fourth proportional to 644,342.48, 889,140.60 and 372,428 is: 513,920.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,342.48 : 889,140.60 = 372,428 : x
  2. Step 2: Convert to fraction form
    644,342.48/889,140.60 = 372,428/x
  3. Step 3: Cross multiply
    644,342.48x = 889,140.60 × 372,428
  4. Step 4: Simplify right side
    644,342.48x = 331,140,855,376.80
  5. Step 5: Solve for x
    x = 331,140,855,376.80/644,342.48
  6. Step 6: Final answer
    x = 513,920.57

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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.