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Finding the Fourth Proportional to 515.71, 711.72 and 338.68

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Solution

The fourth proportional to 515.71, 711.72 and 338.68 is: 467.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.71 : 711.72 = 338.68 : x
  2. Step 2: Convert to fraction form
    515.71/711.72 = 338.68/x
  3. Step 3: Cross multiply
    515.71x = 711.72 × 338.68
  4. Step 4: Simplify right side
    515.71x = 241,040.08
  5. Step 5: Solve for x
    x = 241,040.08/515.71
  6. Step 6: Final answer
    x = 467.40

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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.