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Finding the Fourth Proportional to 2,687.88, 4,007.78 and 2,646.88

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Solution

The fourth proportional to 2,687.88, 4,007.78 and 2,646.88 is: 3,946.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.88 : 4,007.78 = 2,646.88 : x
  2. Step 2: Convert to fraction form
    2,687.88/4,007.78 = 2,646.88/x
  3. Step 3: Cross multiply
    2,687.88x = 4,007.78 × 2,646.88
  4. Step 4: Simplify right side
    2,687.88x = 10,608,099.40
  5. Step 5: Solve for x
    x = 10,608,099.40/2,687.88
  6. Step 6: Final answer
    x = 3,946.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.