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Finding the Fourth Proportional to 2,101.82, 3,152.57 and 640.88

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Solution

The fourth proportional to 2,101.82, 3,152.57 and 640.88 is: 961.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.82 : 3,152.57 = 640.88 : x
  2. Step 2: Convert to fraction form
    2,101.82/3,152.57 = 640.88/x
  3. Step 3: Cross multiply
    2,101.82x = 3,152.57 × 640.88
  4. Step 4: Simplify right side
    2,101.82x = 2,020,400.09
  5. Step 5: Solve for x
    x = 2,020,400.09/2,101.82
  6. Step 6: Final answer
    x = 961.26

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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.