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Finding the Fourth Proportional to 388,131.87, 582,013.44 and 135,381.66

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Solution

The fourth proportional to 388,131.87, 582,013.44 and 135,381.66 is: 203,008.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,131.87 : 582,013.44 = 135,381.66 : x
  2. Step 2: Convert to fraction form
    388,131.87/582,013.44 = 135,381.66/x
  3. Step 3: Cross multiply
    388,131.87x = 582,013.44 × 135,381.66
  4. Step 4: Simplify right side
    388,131.87x = 78,793,945,649.51
  5. Step 5: Solve for x
    x = 78,793,945,649.51/388,131.87
  6. Step 6: Final answer
    x = 203,008.18

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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.