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Finding the Fourth Proportional to 512.16, 706.79 and 279.28

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Solution

The fourth proportional to 512.16, 706.79 and 279.28 is: 385.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.16 : 706.79 = 279.28 : x
  2. Step 2: Convert to fraction form
    512.16/706.79 = 279.28/x
  3. Step 3: Cross multiply
    512.16x = 706.79 × 279.28
  4. Step 4: Simplify right side
    512.16x = 197,393.89
  5. Step 5: Solve for x
    x = 197,393.89/512.16
  6. Step 6: Final answer
    x = 385.42

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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.