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Finding the Fourth Proportional to 1,640.70, 2,465.85 and 1,611.90

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Solution

The fourth proportional to 1,640.70, 2,465.85 and 1,611.90 is: 2,422.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.70 : 2,465.85 = 1,611.90 : x
  2. Step 2: Convert to fraction form
    1,640.70/2,465.85 = 1,611.90/x
  3. Step 3: Cross multiply
    1,640.70x = 2,465.85 × 1,611.90
  4. Step 4: Simplify right side
    1,640.70x = 3,974,703.62
  5. Step 5: Solve for x
    x = 3,974,703.62/1,640.70
  6. Step 6: Final answer
    x = 2,422.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.