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Finding the Fourth Proportional to 90,701, 125,172.92 and 50,415

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Solution

The fourth proportional to 90,701, 125,172.92 and 50,415 is: 69,575.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,701 : 125,172.92 = 50,415 : x
  2. Step 2: Convert to fraction form
    90,701/125,172.92 = 50,415/x
  3. Step 3: Cross multiply
    90,701x = 125,172.92 × 50,415
  4. Step 4: Simplify right side
    90,701x = 6,310,592,761.80
  5. Step 5: Solve for x
    x = 6,310,592,761.80/90,701
  6. Step 6: Final answer
    x = 69,575.78

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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.