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Finding the Fourth Proportional to 138,671.22, 208,136.84 and 72,158.48

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Solution

The fourth proportional to 138,671.22, 208,136.84 and 72,158.48 is: 108,305.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,671.22 : 208,136.84 = 72,158.48 : x
  2. Step 2: Convert to fraction form
    138,671.22/208,136.84 = 72,158.48/x
  3. Step 3: Cross multiply
    138,671.22x = 208,136.84 × 72,158.48
  4. Step 4: Simplify right side
    138,671.22x = 15,018,836,604.93
  5. Step 5: Solve for x
    x = 15,018,836,604.93/138,671.22
  6. Step 6: Final answer
    x = 108,305.36

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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.