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Finding the Fourth Proportional to 2,877.80, 3,969.24 and 2,131.79

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Solution

The fourth proportional to 2,877.80, 3,969.24 and 2,131.79 is: 2,940.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,877.80 : 3,969.24 = 2,131.79 : x
  2. Step 2: Convert to fraction form
    2,877.80/3,969.24 = 2,131.79/x
  3. Step 3: Cross multiply
    2,877.80x = 3,969.24 × 2,131.79
  4. Step 4: Simplify right side
    2,877.80x = 8,461,586.14
  5. Step 5: Solve for x
    x = 8,461,586.14/2,877.80
  6. Step 6: Final answer
    x = 2,940.30

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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.