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Finding the Fourth Proportional to 640.08, 960.40 and 275.14

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Solution

The fourth proportional to 640.08, 960.40 and 275.14 is: 412.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.08 : 960.40 = 275.14 : x
  2. Step 2: Convert to fraction form
    640.08/960.40 = 275.14/x
  3. Step 3: Cross multiply
    640.08x = 960.40 × 275.14
  4. Step 4: Simplify right side
    640.08x = 264,244.46
  5. Step 5: Solve for x
    x = 264,244.46/640.08
  6. Step 6: Final answer
    x = 412.83

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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.