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Finding the Fourth Proportional to 557.79, 768.89 and 391.53

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Solution

The fourth proportional to 557.79, 768.89 and 391.53 is: 539.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.79 : 768.89 = 391.53 : x
  2. Step 2: Convert to fraction form
    557.79/768.89 = 391.53/x
  3. Step 3: Cross multiply
    557.79x = 768.89 × 391.53
  4. Step 4: Simplify right side
    557.79x = 301,047.36
  5. Step 5: Solve for x
    x = 301,047.36/557.79
  6. Step 6: Final answer
    x = 539.72

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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.