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Finding the Fourth Proportional to 640.06, 883.14 and 391.36

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Solution

The fourth proportional to 640.06, 883.14 and 391.36 is: 539.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.06 : 883.14 = 391.36 : x
  2. Step 2: Convert to fraction form
    640.06/883.14 = 391.36/x
  3. Step 3: Cross multiply
    640.06x = 883.14 × 391.36
  4. Step 4: Simplify right side
    640.06x = 345,625.67
  5. Step 5: Solve for x
    x = 345,625.67/640.06
  6. Step 6: Final answer
    x = 539.99

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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.