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Finding the Fourth Proportional to 2,101.28, 3,151.98 and 640.44

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Solution

The fourth proportional to 2,101.28, 3,151.98 and 640.44 is: 960.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.28 : 3,151.98 = 640.44 : x
  2. Step 2: Convert to fraction form
    2,101.28/3,151.98 = 640.44/x
  3. Step 3: Cross multiply
    2,101.28x = 3,151.98 × 640.44
  4. Step 4: Simplify right side
    2,101.28x = 2,018,654.07
  5. Step 5: Solve for x
    x = 2,018,654.07/2,101.28
  6. Step 6: Final answer
    x = 960.68

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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.