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Finding the Fourth Proportional to 129,940.56, 179,287.56 and 76,222.80

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Solution

The fourth proportional to 129,940.56, 179,287.56 and 76,222.80 is: 105,169.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,940.56 : 179,287.56 = 76,222.80 : x
  2. Step 2: Convert to fraction form
    129,940.56/179,287.56 = 76,222.80/x
  3. Step 3: Cross multiply
    129,940.56x = 179,287.56 × 76,222.80
  4. Step 4: Simplify right side
    129,940.56x = 13,665,799,828.37
  5. Step 5: Solve for x
    x = 13,665,799,828.37/129,940.56
  6. Step 6: Final answer
    x = 105,169.62

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1.5x scale

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.