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Finding the Fourth Proportional to 100,990.97, 139,361.16 and 55,666.44

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Solution

The fourth proportional to 100,990.97, 139,361.16 and 55,666.44 is: 76,816.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.97 : 139,361.16 = 55,666.44 : x
  2. Step 2: Convert to fraction form
    100,990.97/139,361.16 = 55,666.44/x
  3. Step 3: Cross multiply
    100,990.97x = 139,361.16 × 55,666.44
  4. Step 4: Simplify right side
    100,990.97x = 7,757,739,651.47
  5. Step 5: Solve for x
    x = 7,757,739,651.47/100,990.97
  6. Step 6: Final answer
    x = 76,816.18

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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.