Home / 149,121.54-205,785.14-81,136.76

Finding the Fourth Proportional to 149,121.54, 205,785.14 and 81,136.76

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Solution

The fourth proportional to 149,121.54, 205,785.14 and 81,136.76 is: 111,967.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,121.54 : 205,785.14 = 81,136.76 : x
  2. Step 2: Convert to fraction form
    149,121.54/205,785.14 = 81,136.76/x
  3. Step 3: Cross multiply
    149,121.54x = 205,785.14 × 81,136.76
  4. Step 4: Simplify right side
    149,121.54x = 16,696,738,081.14
  5. Step 5: Solve for x
    x = 16,696,738,081.14/149,121.54
  6. Step 6: Final answer
    x = 111,967.31

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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.