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Finding the Fourth Proportional to 129,767.40, 179,087.76 and 72,416.97

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Solution

The fourth proportional to 129,767.40, 179,087.76 and 72,416.97 is: 99,940.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,767.40 : 179,087.76 = 72,416.97 : x
  2. Step 2: Convert to fraction form
    129,767.40/179,087.76 = 72,416.97/x
  3. Step 3: Cross multiply
    129,767.40x = 179,087.76 × 72,416.97
  4. Step 4: Simplify right side
    129,767.40x = 12,968,992,943.29
  5. Step 5: Solve for x
    x = 12,968,992,943.29/129,767.40
  6. Step 6: Final answer
    x = 99,940.30

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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.