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Finding the Fourth Proportional to 129,662.80, 194,105.40 and 77,045.20

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Solution

The fourth proportional to 129,662.80, 194,105.40 and 77,045.20 is: 115,336.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,662.80 : 194,105.40 = 77,045.20 : x
  2. Step 2: Convert to fraction form
    129,662.80/194,105.40 = 77,045.20/x
  3. Step 3: Cross multiply
    129,662.80x = 194,105.40 × 77,045.20
  4. Step 4: Simplify right side
    129,662.80x = 14,954,889,364.08
  5. Step 5: Solve for x
    x = 14,954,889,364.08/129,662.80
  6. Step 6: Final answer
    x = 115,336.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.