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Finding the Fourth Proportional to 515.26, 711.03 and 305.43

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Solution

The fourth proportional to 515.26, 711.03 and 305.43 is: 421.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.26 : 711.03 = 305.43 : x
  2. Step 2: Convert to fraction form
    515.26/711.03 = 305.43/x
  3. Step 3: Cross multiply
    515.26x = 711.03 × 305.43
  4. Step 4: Simplify right side
    515.26x = 217,169.89
  5. Step 5: Solve for x
    x = 217,169.89/515.26
  6. Step 6: Final answer
    x = 421.48

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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.