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Finding the Fourth Proportional to 512.17, 706.78 and 279.30

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Solution

The fourth proportional to 512.17, 706.78 and 279.30 is: 385.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.17 : 706.78 = 279.30 : x
  2. Step 2: Convert to fraction form
    512.17/706.78 = 279.30/x
  3. Step 3: Cross multiply
    512.17x = 706.78 × 279.30
  4. Step 4: Simplify right side
    512.17x = 197,403.65
  5. Step 5: Solve for x
    x = 197,403.65/512.17
  6. Step 6: Final answer
    x = 385.43

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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.