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Finding the Fourth Proportional to 511.88, 706.40 and 279

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Solution

The fourth proportional to 511.88, 706.40 and 279 is: 385.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.88 : 706.40 = 279 : x
  2. Step 2: Convert to fraction form
    511.88/706.40 = 279/x
  3. Step 3: Cross multiply
    511.88x = 706.40 × 279
  4. Step 4: Simplify right side
    511.88x = 197,084.21
  5. Step 5: Solve for x
    x = 197,084.21/511.88
  6. Step 6: Final answer
    x = 385.02

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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.