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Finding the Fourth Proportional to 91,395, 126,142.38 and 51,651

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Solution

The fourth proportional to 91,395, 126,142.38 and 51,651 is: 71,288.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,395 : 126,142.38 = 51,651 : x
  2. Step 2: Convert to fraction form
    91,395/126,142.38 = 51,651/x
  3. Step 3: Cross multiply
    91,395x = 126,142.38 × 51,651
  4. Step 4: Simplify right side
    91,395x = 6,515,380,069.38
  5. Step 5: Solve for x
    x = 6,515,380,069.38/91,395
  6. Step 6: Final answer
    x = 71,288.15

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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.