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Finding the Fourth Proportional to 129,638.79, 178,895.11 and 73,053.81

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Solution

The fourth proportional to 129,638.79, 178,895.11 and 73,053.81 is: 100,810.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,638.79 : 178,895.11 = 73,053.81 : x
  2. Step 2: Convert to fraction form
    129,638.79/178,895.11 = 73,053.81/x
  3. Step 3: Cross multiply
    129,638.79x = 178,895.11 × 73,053.81
  4. Step 4: Simplify right side
    129,638.79x = 13,068,969,375.87
  5. Step 5: Solve for x
    x = 13,068,969,375.87/129,638.79
  6. Step 6: Final answer
    x = 100,810.64

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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.