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Finding the Fourth Proportional to 91,165, 125,812.02 and 51,421

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Solution

The fourth proportional to 91,165, 125,812.02 and 51,421 is: 70,963.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,165 : 125,812.02 = 51,421 : x
  2. Step 2: Convert to fraction form
    91,165/125,812.02 = 51,421/x
  3. Step 3: Cross multiply
    91,165x = 125,812.02 × 51,421
  4. Step 4: Simplify right side
    91,165x = 6,469,379,880.42
  5. Step 5: Solve for x
    x = 6,469,379,880.42/91,165
  6. Step 6: Final answer
    x = 70,963.42

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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.