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Finding the Fourth Proportional to 640.53, 958.32 and 434.12

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Solution

The fourth proportional to 640.53, 958.32 and 434.12 is: 649.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.53 : 958.32 = 434.12 : x
  2. Step 2: Convert to fraction form
    640.53/958.32 = 434.12/x
  3. Step 3: Cross multiply
    640.53x = 958.32 × 434.12
  4. Step 4: Simplify right side
    640.53x = 416,021.09
  5. Step 5: Solve for x
    x = 416,021.09/640.53
  6. Step 6: Final answer
    x = 649.50

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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.