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Finding the Fourth Proportional to 512.72, 707.72 and 338.48

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Solution

The fourth proportional to 512.72, 707.72 and 338.48 is: 467.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.72 : 707.72 = 338.48 : x
  2. Step 2: Convert to fraction form
    512.72/707.72 = 338.48/x
  3. Step 3: Cross multiply
    512.72x = 707.72 × 338.48
  4. Step 4: Simplify right side
    512.72x = 239,549.07
  5. Step 5: Solve for x
    x = 239,549.07/512.72
  6. Step 6: Final answer
    x = 467.21

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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.