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Finding the Fourth Proportional to 557.71, 768.83 and 391.41

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Solution

The fourth proportional to 557.71, 768.83 and 391.41 is: 539.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.71 : 768.83 = 391.41 : x
  2. Step 2: Convert to fraction form
    557.71/768.83 = 391.41/x
  3. Step 3: Cross multiply
    557.71x = 768.83 × 391.41
  4. Step 4: Simplify right side
    557.71x = 300,927.75
  5. Step 5: Solve for x
    x = 300,927.75/557.71
  6. Step 6: Final answer
    x = 539.58

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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.