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Finding the Fourth Proportional to 90,822, 125,334.90 and 51,078

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Solution

The fourth proportional to 90,822, 125,334.90 and 51,078 is: 70,487.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,822 : 125,334.90 = 51,078 : x
  2. Step 2: Convert to fraction form
    90,822/125,334.90 = 51,078/x
  3. Step 3: Cross multiply
    90,822x = 125,334.90 × 51,078
  4. Step 4: Simplify right side
    90,822x = 6,401,856,022.20
  5. Step 5: Solve for x
    x = 6,401,856,022.20/90,822
  6. Step 6: Final answer
    x = 70,487.94

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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.