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Finding the Fourth Proportional to 557.74, 769.33 and 391.94

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Solution

The fourth proportional to 557.74, 769.33 and 391.94 is: 540.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.74 : 769.33 = 391.94 : x
  2. Step 2: Convert to fraction form
    557.74/769.33 = 391.94/x
  3. Step 3: Cross multiply
    557.74x = 769.33 × 391.94
  4. Step 4: Simplify right side
    557.74x = 301,531.20
  5. Step 5: Solve for x
    x = 301,531.20/557.74
  6. Step 6: Final answer
    x = 540.63

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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.