Home / 149,121.32-205,781.25-81,138.56

Finding the Fourth Proportional to 149,121.32, 205,781.25 and 81,138.56

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Solution

The fourth proportional to 149,121.32, 205,781.25 and 81,138.56 is: 111,967.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,121.32 : 205,781.25 = 81,138.56 : x
  2. Step 2: Convert to fraction form
    149,121.32/205,781.25 = 81,138.56/x
  3. Step 3: Cross multiply
    149,121.32x = 205,781.25 × 81,138.56
  4. Step 4: Simplify right side
    149,121.32x = 16,696,793,271.09
  5. Step 5: Solve for x
    x = 16,696,793,271.09/149,121.32
  6. Step 6: Final answer
    x = 111,967.85

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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.