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Finding the Fourth Proportional to 135,648.52, 203,515.12 and 81,672.38

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Solution

The fourth proportional to 135,648.52, 203,515.12 and 81,672.38 is: 122,534.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,648.52 : 203,515.12 = 81,672.38 : x
  2. Step 2: Convert to fraction form
    135,648.52/203,515.12 = 81,672.38/x
  3. Step 3: Cross multiply
    135,648.52x = 203,515.12 × 81,672.38
  4. Step 4: Simplify right side
    135,648.52x = 16,621,564,216.39
  5. Step 5: Solve for x
    x = 16,621,564,216.39/135,648.52
  6. Step 6: Final answer
    x = 122,534.06

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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.