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Finding the Fourth Proportional to 640.08, 960.39 and 275.13

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Solution

The fourth proportional to 640.08, 960.39 and 275.13 is: 412.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.08 : 960.39 = 275.13 : x
  2. Step 2: Convert to fraction form
    640.08/960.39 = 275.13/x
  3. Step 3: Cross multiply
    640.08x = 960.39 × 275.13
  4. Step 4: Simplify right side
    640.08x = 264,232.10
  5. Step 5: Solve for x
    x = 264,232.10/640.08
  6. Step 6: Final answer
    x = 412.81

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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.