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Finding the Fourth Proportional to 76,131.29, 104,991.36 and 65,372.49

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Solution

The fourth proportional to 76,131.29, 104,991.36 and 65,372.49 is: 90,154.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,131.29 : 104,991.36 = 65,372.49 : x
  2. Step 2: Convert to fraction form
    76,131.29/104,991.36 = 65,372.49/x
  3. Step 3: Cross multiply
    76,131.29x = 104,991.36 × 65,372.49
  4. Step 4: Simplify right side
    76,131.29x = 6,863,546,631.69
  5. Step 5: Solve for x
    x = 6,863,546,631.69/76,131.29
  6. Step 6: Final answer
    x = 90,154.09

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1.5x scale

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.