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Finding the Fourth Proportional to 640.96, 960.51 and 348.21

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Solution

The fourth proportional to 640.96, 960.51 and 348.21 is: 521.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.96 : 960.51 = 348.21 : x
  2. Step 2: Convert to fraction form
    640.96/960.51 = 348.21/x
  3. Step 3: Cross multiply
    640.96x = 960.51 × 348.21
  4. Step 4: Simplify right side
    640.96x = 334,460.39
  5. Step 5: Solve for x
    x = 334,460.39/640.96
  6. Step 6: Final answer
    x = 521.81

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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.