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Finding the Fourth Proportional to 129,718.70, 178,991.22 and 73,119.14

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Solution

The fourth proportional to 129,718.70, 178,991.22 and 73,119.14 is: 100,892.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,718.70 : 178,991.22 = 73,119.14 : x
  2. Step 2: Convert to fraction form
    129,718.70/178,991.22 = 73,119.14/x
  3. Step 3: Cross multiply
    129,718.70x = 178,991.22 × 73,119.14
  4. Step 4: Simplify right side
    129,718.70x = 13,087,684,073.95
  5. Step 5: Solve for x
    x = 13,087,684,073.95/129,718.70
  6. Step 6: Final answer
    x = 100,892.81

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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.