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Finding the Fourth Proportional to 2,976.90, 4,102.97 and 1,980.47

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Solution

The fourth proportional to 2,976.90, 4,102.97 and 1,980.47 is: 2,729.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,976.90 : 4,102.97 = 1,980.47 : x
  2. Step 2: Convert to fraction form
    2,976.90/4,102.97 = 1,980.47/x
  3. Step 3: Cross multiply
    2,976.90x = 4,102.97 × 1,980.47
  4. Step 4: Simplify right side
    2,976.90x = 8,125,778.58
  5. Step 5: Solve for x
    x = 8,125,778.58/2,976.90
  6. Step 6: Final answer
    x = 2,729.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.