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Finding the Fourth Proportional to 589, 812.82 and 515.56

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Solution

The fourth proportional to 589, 812.82 and 515.56 is: 711.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    589 : 812.82 = 515.56 : x
  2. Step 2: Convert to fraction form
    589/812.82 = 515.56/x
  3. Step 3: Cross multiply
    589x = 812.82 × 515.56
  4. Step 4: Simplify right side
    589x = 419,057.48
  5. Step 5: Solve for x
    x = 419,057.48/589
  6. Step 6: Final answer
    x = 711.47

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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.