Home / 129,709.78-178,999.49-73,121.15

Finding the Fourth Proportional to 129,709.78, 178,999.49 and 73,121.15

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Solution

The fourth proportional to 129,709.78, 178,999.49 and 73,121.15 is: 100,907.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,709.78 : 178,999.49 = 73,121.15 : x
  2. Step 2: Convert to fraction form
    129,709.78/178,999.49 = 73,121.15/x
  3. Step 3: Cross multiply
    129,709.78x = 178,999.49 × 73,121.15
  4. Step 4: Simplify right side
    129,709.78x = 13,088,648,558.21
  5. Step 5: Solve for x
    x = 13,088,648,558.21/129,709.78
  6. Step 6: Final answer
    x = 100,907.18

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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.