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Finding the Fourth Proportional to 640.13, 883.33 and 391.34

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Solution

The fourth proportional to 640.13, 883.33 and 391.34 is: 540.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.13 : 883.33 = 391.34 : x
  2. Step 2: Convert to fraction form
    640.13/883.33 = 391.34/x
  3. Step 3: Cross multiply
    640.13x = 883.33 × 391.34
  4. Step 4: Simplify right side
    640.13x = 345,683.59
  5. Step 5: Solve for x
    x = 345,683.59/640.13
  6. Step 6: Final answer
    x = 540.03

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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.