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Finding the Fourth Proportional to 640.37, 961.58 and 409.37

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Solution

The fourth proportional to 640.37, 961.58 and 409.37 is: 614.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.37 : 961.58 = 409.37 : x
  2. Step 2: Convert to fraction form
    640.37/961.58 = 409.37/x
  3. Step 3: Cross multiply
    640.37x = 961.58 × 409.37
  4. Step 4: Simplify right side
    640.37x = 393,635.15
  5. Step 5: Solve for x
    x = 393,635.15/640.37
  6. Step 6: Final answer
    x = 614.70

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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.