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Finding the Fourth Proportional to 129,762.42, 179,072.16 and 73,173.78

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Solution

The fourth proportional to 129,762.42, 179,072.16 and 73,173.78 is: 100,979.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,762.42 : 179,072.16 = 73,173.78 : x
  2. Step 2: Convert to fraction form
    129,762.42/179,072.16 = 73,173.78/x
  3. Step 3: Cross multiply
    129,762.42x = 179,072.16 × 73,173.78
  4. Step 4: Simplify right side
    129,762.42x = 13,103,386,839.96
  5. Step 5: Solve for x
    x = 13,103,386,839.96/129,762.42
  6. Step 6: Final answer
    x = 100,979.83

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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.