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Finding the Fourth Proportional to 512.69, 707.45 and 288.60

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Solution

The fourth proportional to 512.69, 707.45 and 288.60 is: 398.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.69 : 707.45 = 288.60 : x
  2. Step 2: Convert to fraction form
    512.69/707.45 = 288.60/x
  3. Step 3: Cross multiply
    512.69x = 707.45 × 288.60
  4. Step 4: Simplify right side
    512.69x = 204,171.73
  5. Step 5: Solve for x
    x = 204,171.73/512.69
  6. Step 6: Final answer
    x = 398.23

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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.