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Finding the Fourth Proportional to 619,418.39, 855,163.85 and 390,172.18

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Solution

The fourth proportional to 619,418.39, 855,163.85 and 390,172.18 is: 538,668.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,418.39 : 855,163.85 = 390,172.18 : x
  2. Step 2: Convert to fraction form
    619,418.39/855,163.85 = 390,172.18/x
  3. Step 3: Cross multiply
    619,418.39x = 855,163.85 × 390,172.18
  4. Step 4: Simplify right side
    619,418.39x = 333,661,143,611.69
  5. Step 5: Solve for x
    x = 333,661,143,611.69/619,418.39
  6. Step 6: Final answer
    x = 538,668.45

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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.