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Finding the Fourth Proportional to 392,039.87, 587,989.53 and 103,853.43

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Solution

The fourth proportional to 392,039.87, 587,989.53 and 103,853.43 is: 155,761.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,039.87 : 587,989.53 = 103,853.43 : x
  2. Step 2: Convert to fraction form
    392,039.87/587,989.53 = 103,853.43/x
  3. Step 3: Cross multiply
    392,039.87x = 587,989.53 × 103,853.43
  4. Step 4: Simplify right side
    392,039.87x = 61,064,729,494.59
  5. Step 5: Solve for x
    x = 61,064,729,494.59/392,039.87
  6. Step 6: Final answer
    x = 155,761.53

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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.