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Finding the Fourth Proportional to 619,692, 855,174.96 and 351,420

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Solution

The fourth proportional to 619,692, 855,174.96 and 351,420 is: 484,959.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,692 : 855,174.96 = 351,420 : x
  2. Step 2: Convert to fraction form
    619,692/855,174.96 = 351,420/x
  3. Step 3: Cross multiply
    619,692x = 855,174.96 × 351,420
  4. Step 4: Simplify right side
    619,692x = 300,525,584,443.20
  5. Step 5: Solve for x
    x = 300,525,584,443.20/619,692
  6. Step 6: Final answer
    x = 484,959.60

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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.