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Finding the Fourth Proportional to 515.86, 711.47 and 329.39

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Solution

The fourth proportional to 515.86, 711.47 and 329.39 is: 454.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.86 : 711.47 = 329.39 : x
  2. Step 2: Convert to fraction form
    515.86/711.47 = 329.39/x
  3. Step 3: Cross multiply
    515.86x = 711.47 × 329.39
  4. Step 4: Simplify right side
    515.86x = 234,351.10
  5. Step 5: Solve for x
    x = 234,351.10/515.86
  6. Step 6: Final answer
    x = 454.29

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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.