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Finding the Fourth Proportional to 640.14, 883.26 and 391.52

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Solution

The fourth proportional to 640.14, 883.26 and 391.52 is: 540.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.14 : 883.26 = 391.52 : x
  2. Step 2: Convert to fraction form
    640.14/883.26 = 391.52/x
  3. Step 3: Cross multiply
    640.14x = 883.26 × 391.52
  4. Step 4: Simplify right side
    640.14x = 345,809.54
  5. Step 5: Solve for x
    x = 345,809.54/640.14
  6. Step 6: Final answer
    x = 540.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.