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Finding the Fourth Proportional to 2,689.70, 3,711.77 and 1,641.75

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Solution

The fourth proportional to 2,689.70, 3,711.77 and 1,641.75 is: 2,265.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.70 : 3,711.77 = 1,641.75 : x
  2. Step 2: Convert to fraction form
    2,689.70/3,711.77 = 1,641.75/x
  3. Step 3: Cross multiply
    2,689.70x = 3,711.77 × 1,641.75
  4. Step 4: Simplify right side
    2,689.70x = 6,093,790.19
  5. Step 5: Solve for x
    x = 6,093,790.19/2,689.70
  6. Step 6: Final answer
    x = 2,265.61

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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.