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Finding the Fourth Proportional to 557.20, 769.02 and 391.66

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Solution

The fourth proportional to 557.20, 769.02 and 391.66 is: 540.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.20 : 769.02 = 391.66 : x
  2. Step 2: Convert to fraction form
    557.20/769.02 = 391.66/x
  3. Step 3: Cross multiply
    557.20x = 769.02 × 391.66
  4. Step 4: Simplify right side
    557.20x = 301,194.37
  5. Step 5: Solve for x
    x = 301,194.37/557.20
  6. Step 6: Final answer
    x = 540.55

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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.