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Finding the Fourth Proportional to 129,403.44, 178,578 and 72,043.56

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Solution

The fourth proportional to 129,403.44, 178,578 and 72,043.56 is: 99,420.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,403.44 : 178,578 = 72,043.56 : x
  2. Step 2: Convert to fraction form
    129,403.44/178,578 = 72,043.56/x
  3. Step 3: Cross multiply
    129,403.44x = 178,578 × 72,043.56
  4. Step 4: Simplify right side
    129,403.44x = 12,865,394,857.68
  5. Step 5: Solve for x
    x = 12,865,394,857.68/129,403.44
  6. Step 6: Final answer
    x = 99,420.81

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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.