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Finding the Fourth Proportional to 640.24, 960.48 and 274.96

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Solution

The fourth proportional to 640.24, 960.48 and 274.96 is: 412.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.24 : 960.48 = 274.96 : x
  2. Step 2: Convert to fraction form
    640.24/960.48 = 274.96/x
  3. Step 3: Cross multiply
    640.24x = 960.48 × 274.96
  4. Step 4: Simplify right side
    640.24x = 264,093.58
  5. Step 5: Solve for x
    x = 264,093.58/640.24
  6. Step 6: Final answer
    x = 412.49

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1.5x scale

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.