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Finding the Fourth Proportional to 129,830.80, 194,746.20 and 128,081.20

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Solution

The fourth proportional to 129,830.80, 194,746.20 and 128,081.20 is: 192,121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,830.80 : 194,746.20 = 128,081.20 : x
  2. Step 2: Convert to fraction form
    129,830.80/194,746.20 = 128,081.20/x
  3. Step 3: Cross multiply
    129,830.80x = 194,746.20 × 128,081.20
  4. Step 4: Simplify right side
    129,830.80x = 24,943,326,991.44
  5. Step 5: Solve for x
    x = 24,943,326,991.44/129,830.80
  6. Step 6: Final answer
    x = 192,121.80

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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.