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Finding the Fourth Proportional to 557.60, 768.23 and 391.55

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Solution

The fourth proportional to 557.60, 768.23 and 391.55 is: 539.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.60 : 768.23 = 391.55 : x
  2. Step 2: Convert to fraction form
    557.60/768.23 = 391.55/x
  3. Step 3: Cross multiply
    557.60x = 768.23 × 391.55
  4. Step 4: Simplify right side
    557.60x = 300,796.58
  5. Step 5: Solve for x
    x = 300,796.58/557.60
  6. Step 6: Final answer
    x = 539.45

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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.