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Finding the Fourth Proportional to 2,865.88, 3,955.74 and 1,687.64

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Solution

The fourth proportional to 2,865.88, 3,955.74 and 1,687.64 is: 2,329.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,865.88 : 3,955.74 = 1,687.64 : x
  2. Step 2: Convert to fraction form
    2,865.88/3,955.74 = 1,687.64/x
  3. Step 3: Cross multiply
    2,865.88x = 3,955.74 × 1,687.64
  4. Step 4: Simplify right side
    2,865.88x = 6,675,838.95
  5. Step 5: Solve for x
    x = 6,675,838.95/2,865.88
  6. Step 6: Final answer
    x = 2,329.42

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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.