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Finding the Fourth Proportional to 515.79, 711.90 and 303.24

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Solution

The fourth proportional to 515.79, 711.90 and 303.24 is: 418.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.79 : 711.90 = 303.24 : x
  2. Step 2: Convert to fraction form
    515.79/711.90 = 303.24/x
  3. Step 3: Cross multiply
    515.79x = 711.90 × 303.24
  4. Step 4: Simplify right side
    515.79x = 215,876.56
  5. Step 5: Solve for x
    x = 215,876.56/515.79
  6. Step 6: Final answer
    x = 418.54

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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.