Home / 149,138.39-205,806.84-81,153.79

Finding the Fourth Proportional to 149,138.39, 205,806.84 and 81,153.79

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Solution

The fourth proportional to 149,138.39, 205,806.84 and 81,153.79 is: 111,989.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,138.39 : 205,806.84 = 81,153.79 : x
  2. Step 2: Convert to fraction form
    149,138.39/205,806.84 = 81,153.79/x
  3. Step 3: Cross multiply
    149,138.39x = 205,806.84 × 81,153.79
  4. Step 4: Simplify right side
    149,138.39x = 16,702,005,073.92
  5. Step 5: Solve for x
    x = 16,702,005,073.92/149,138.39
  6. Step 6: Final answer
    x = 111,989.98

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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.