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Finding the Fourth Proportional to 112,576.21, 168,642.39 and 91,540

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Solution

The fourth proportional to 112,576.21, 168,642.39 and 91,540 is: 137,129.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,576.21 : 168,642.39 = 91,540 : x
  2. Step 2: Convert to fraction form
    112,576.21/168,642.39 = 91,540/x
  3. Step 3: Cross multiply
    112,576.21x = 168,642.39 × 91,540
  4. Step 4: Simplify right side
    112,576.21x = 15,437,524,380.60
  5. Step 5: Solve for x
    x = 15,437,524,380.60/112,576.21
  6. Step 6: Final answer
    x = 137,129.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.