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Finding the Fourth Proportional to 149,603.55, 206,448.41 and 81,621.87

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Solution

The fourth proportional to 149,603.55, 206,448.41 and 81,621.87 is: 112,635.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,603.55 : 206,448.41 = 81,621.87 : x
  2. Step 2: Convert to fraction form
    149,603.55/206,448.41 = 81,621.87/x
  3. Step 3: Cross multiply
    149,603.55x = 206,448.41 × 81,621.87
  4. Step 4: Simplify right side
    149,603.55x = 16,850,705,282.73
  5. Step 5: Solve for x
    x = 16,850,705,282.73/149,603.55
  6. Step 6: Final answer
    x = 112,635.73

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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.