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Finding the Fourth Proportional to 515.31, 711.26 and 318.99

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Solution

The fourth proportional to 515.31, 711.26 and 318.99 is: 440.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.31 : 711.26 = 318.99 : x
  2. Step 2: Convert to fraction form
    515.31/711.26 = 318.99/x
  3. Step 3: Cross multiply
    515.31x = 711.26 × 318.99
  4. Step 4: Simplify right side
    515.31x = 226,879.68
  5. Step 5: Solve for x
    x = 226,879.68/515.31
  6. Step 6: Final answer
    x = 440.28

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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.