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Finding the Fourth Proportional to 2,988.96, 4,131.98 and 2,739.88

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Solution

The fourth proportional to 2,988.96, 4,131.98 and 2,739.88 is: 3,787.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,988.96 : 4,131.98 = 2,739.88 : x
  2. Step 2: Convert to fraction form
    2,988.96/4,131.98 = 2,739.88/x
  3. Step 3: Cross multiply
    2,988.96x = 4,131.98 × 2,739.88
  4. Step 4: Simplify right side
    2,988.96x = 11,321,129.36
  5. Step 5: Solve for x
    x = 11,321,129.36/2,988.96
  6. Step 6: Final answer
    x = 3,787.65

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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.