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Finding the Fourth Proportional to 129,720.40, 194,273.40 and 87,941.20

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Solution

The fourth proportional to 129,720.40, 194,273.40 and 87,941.20 is: 131,703.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,720.40 : 194,273.40 = 87,941.20 : x
  2. Step 2: Convert to fraction form
    129,720.40/194,273.40 = 87,941.20/x
  3. Step 3: Cross multiply
    129,720.40x = 194,273.40 × 87,941.20
  4. Step 4: Simplify right side
    129,720.40x = 17,084,635,924.08
  5. Step 5: Solve for x
    x = 17,084,635,924.08/129,720.40
  6. Step 6: Final answer
    x = 131,703.54

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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.