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Finding the Fourth Proportional to 515.64, 711.24 and 318.95

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Solution

The fourth proportional to 515.64, 711.24 and 318.95 is: 439.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.64 : 711.24 = 318.95 : x
  2. Step 2: Convert to fraction form
    515.64/711.24 = 318.95/x
  3. Step 3: Cross multiply
    515.64x = 711.24 × 318.95
  4. Step 4: Simplify right side
    515.64x = 226,846.44
  5. Step 5: Solve for x
    x = 226,846.44/515.64
  6. Step 6: Final answer
    x = 439.93

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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.