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Finding the Fourth Proportional to 2,179.13, 3,269.23 and 640.13

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Solution

The fourth proportional to 2,179.13, 3,269.23 and 640.13 is: 960.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,179.13 : 3,269.23 = 640.13 : x
  2. Step 2: Convert to fraction form
    2,179.13/3,269.23 = 640.13/x
  3. Step 3: Cross multiply
    2,179.13x = 3,269.23 × 640.13
  4. Step 4: Simplify right side
    2,179.13x = 2,092,714.25
  5. Step 5: Solve for x
    x = 2,092,714.25/2,179.13
  6. Step 6: Final answer
    x = 960.35

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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.