Home / 4,081.20-6,121.80-1,307.90

Finding the Fourth Proportional to 4,081.20, 6,121.80 and 1,307.90

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Solution

The fourth proportional to 4,081.20, 6,121.80 and 1,307.90 is: 1,961.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,081.20 : 6,121.80 = 1,307.90 : x
  2. Step 2: Convert to fraction form
    4,081.20/6,121.80 = 1,307.90/x
  3. Step 3: Cross multiply
    4,081.20x = 6,121.80 × 1,307.90
  4. Step 4: Simplify right side
    4,081.20x = 8,006,671.61
  5. Step 5: Solve for x
    x = 8,006,671.61/4,081.20
  6. Step 6: Final answer
    x = 1,961.84

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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.