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Finding the Fourth Proportional to 129,897.20, 194,845.80 and 87,906.80

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Solution

The fourth proportional to 129,897.20, 194,845.80 and 87,906.80 is: 131,860.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,897.20 : 194,845.80 = 87,906.80 : x
  2. Step 2: Convert to fraction form
    129,897.20/194,845.80 = 87,906.80/x
  3. Step 3: Cross multiply
    129,897.20x = 194,845.80 × 87,906.80
  4. Step 4: Simplify right side
    129,897.20x = 17,128,270,771.44
  5. Step 5: Solve for x
    x = 17,128,270,771.44/129,897.20
  6. Step 6: Final answer
    x = 131,860.20

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1.5x scale

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.