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Finding the Fourth Proportional to 640.23, 883.37 and 391.53

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Solution

The fourth proportional to 640.23, 883.37 and 391.53 is: 540.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.23 : 883.37 = 391.53 : x
  2. Step 2: Convert to fraction form
    640.23/883.37 = 391.53/x
  3. Step 3: Cross multiply
    640.23x = 883.37 × 391.53
  4. Step 4: Simplify right side
    640.23x = 345,863.90
  5. Step 5: Solve for x
    x = 345,863.90/640.23
  6. Step 6: Final answer
    x = 540.22

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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.