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Finding the Fourth Proportional to 640.22, 960.57 and 255.50

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Solution

The fourth proportional to 640.22, 960.57 and 255.50 is: 383.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.22 : 960.57 = 255.50 : x
  2. Step 2: Convert to fraction form
    640.22/960.57 = 255.50/x
  3. Step 3: Cross multiply
    640.22x = 960.57 × 255.50
  4. Step 4: Simplify right side
    640.22x = 245,425.64
  5. Step 5: Solve for x
    x = 245,425.64/640.22
  6. Step 6: Final answer
    x = 383.35

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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.