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Finding the Fourth Proportional to 129,636.43, 178,866.96 and 73,047.80

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Solution

The fourth proportional to 129,636.43, 178,866.96 and 73,047.80 is: 100,788.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,636.43 : 178,866.96 = 73,047.80 : x
  2. Step 2: Convert to fraction form
    129,636.43/178,866.96 = 73,047.80/x
  3. Step 3: Cross multiply
    129,636.43x = 178,866.96 × 73,047.80
  4. Step 4: Simplify right side
    129,636.43x = 13,065,837,920.69
  5. Step 5: Solve for x
    x = 13,065,837,920.69/129,636.43
  6. Step 6: Final answer
    x = 100,788.32

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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.