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Finding the Fourth Proportional to 515.70, 711.59 and 338.72

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Solution

The fourth proportional to 515.70, 711.59 and 338.72 is: 467.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.70 : 711.59 = 338.72 : x
  2. Step 2: Convert to fraction form
    515.70/711.59 = 338.72/x
  3. Step 3: Cross multiply
    515.70x = 711.59 × 338.72
  4. Step 4: Simplify right side
    515.70x = 241,024.51
  5. Step 5: Solve for x
    x = 241,024.51/515.70
  6. Step 6: Final answer
    x = 467.37

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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.