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Finding the Fourth Proportional to 138,640.80, 208,012.40 and 133,520.80

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Solution

The fourth proportional to 138,640.80, 208,012.40 and 133,520.80 is: 200,330.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,640.80 : 208,012.40 = 133,520.80 : x
  2. Step 2: Convert to fraction form
    138,640.80/208,012.40 = 133,520.80/x
  3. Step 3: Cross multiply
    138,640.80x = 208,012.40 × 133,520.80
  4. Step 4: Simplify right side
    138,640.80x = 27,773,982,057.92
  5. Step 5: Solve for x
    x = 27,773,982,057.92/138,640.80
  6. Step 6: Final answer
    x = 200,330.51

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1.5x scale

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.