Home / 129,986.20-194,979.30-85,371.40

Finding the Fourth Proportional to 129,986.20, 194,979.30 and 85,371.40

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Solution

The fourth proportional to 129,986.20, 194,979.30 and 85,371.40 is: 128,057.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,986.20 : 194,979.30 = 85,371.40 : x
  2. Step 2: Convert to fraction form
    129,986.20/194,979.30 = 85,371.40/x
  3. Step 3: Cross multiply
    129,986.20x = 194,979.30 × 85,371.40
  4. Step 4: Simplify right side
    129,986.20x = 16,645,655,812.02
  5. Step 5: Solve for x
    x = 16,645,655,812.02/129,986.20
  6. Step 6: Final answer
    x = 128,057.10

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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.