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Finding the Fourth Proportional to 100,840.43, 139,202.82 and 71,787.53

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Solution

The fourth proportional to 100,840.43, 139,202.82 and 71,787.53 is: 99,097.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,840.43 : 139,202.82 = 71,787.53 : x
  2. Step 2: Convert to fraction form
    100,840.43/139,202.82 = 71,787.53/x
  3. Step 3: Cross multiply
    100,840.43x = 139,202.82 × 71,787.53
  4. Step 4: Simplify right side
    100,840.43x = 9,993,025,920.82
  5. Step 5: Solve for x
    x = 9,993,025,920.82/100,840.43
  6. Step 6: Final answer
    x = 99,097.42

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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.