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Finding the Fourth Proportional to 100,990.73, 139,361.78 and 55,659.68

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Solution

The fourth proportional to 100,990.73, 139,361.78 and 55,659.68 is: 76,807.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.73 : 139,361.78 = 55,659.68 : x
  2. Step 2: Convert to fraction form
    100,990.73/139,361.78 = 55,659.68/x
  3. Step 3: Cross multiply
    100,990.73x = 139,361.78 × 55,659.68
  4. Step 4: Simplify right side
    100,990.73x = 7,756,832,566.58
  5. Step 5: Solve for x
    x = 7,756,832,566.58/100,990.73
  6. Step 6: Final answer
    x = 76,807.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.