Home / 129,720.70-194,581.05-78,982.30

Finding the Fourth Proportional to 129,720.70, 194,581.05 and 78,982.30

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Solution

The fourth proportional to 129,720.70, 194,581.05 and 78,982.30 is: 118,473.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,720.70 : 194,581.05 = 78,982.30 : x
  2. Step 2: Convert to fraction form
    129,720.70/194,581.05 = 78,982.30/x
  3. Step 3: Cross multiply
    129,720.70x = 194,581.05 × 78,982.30
  4. Step 4: Simplify right side
    129,720.70x = 15,368,458,865.42
  5. Step 5: Solve for x
    x = 15,368,458,865.42/129,720.70
  6. Step 6: Final answer
    x = 118,473.45

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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.