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Finding the Fourth Proportional to 138,728.80, 208,093.20 and 134,136.10

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Solution

The fourth proportional to 138,728.80, 208,093.20 and 134,136.10 is: 201,204.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,728.80 : 208,093.20 = 134,136.10 : x
  2. Step 2: Convert to fraction form
    138,728.80/208,093.20 = 134,136.10/x
  3. Step 3: Cross multiply
    138,728.80x = 208,093.20 × 134,136.10
  4. Step 4: Simplify right side
    138,728.80x = 27,912,810,284.52
  5. Step 5: Solve for x
    x = 27,912,810,284.52/138,728.80
  6. Step 6: Final answer
    x = 201,204.15

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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.