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Finding the Fourth Proportional to 512.12, 706.69 and 288.09

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Solution

The fourth proportional to 512.12, 706.69 and 288.09 is: 397.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.12 : 706.69 = 288.09 : x
  2. Step 2: Convert to fraction form
    512.12/706.69 = 288.09/x
  3. Step 3: Cross multiply
    512.12x = 706.69 × 288.09
  4. Step 4: Simplify right side
    512.12x = 203,586.95
  5. Step 5: Solve for x
    x = 203,586.95/512.12
  6. Step 6: Final answer
    x = 397.54

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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.