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Finding the Fourth Proportional to 640.00, 882.85 and 391.23

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Solution

The fourth proportional to 640.00, 882.85 and 391.23 is: 539.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.00 : 882.85 = 391.23 : x
  2. Step 2: Convert to fraction form
    640.00/882.85 = 391.23/x
  3. Step 3: Cross multiply
    640.00x = 882.85 × 391.23
  4. Step 4: Simplify right side
    640.00x = 345,397.16
  5. Step 5: Solve for x
    x = 345,397.16/640.00
  6. Step 6: Final answer
    x = 539.68

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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.