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Finding the Fourth Proportional to 512.75, 707.60 and 279.88

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Solution

The fourth proportional to 512.75, 707.60 and 279.88 is: 386.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.75 : 707.60 = 279.88 : x
  2. Step 2: Convert to fraction form
    512.75/707.60 = 279.88/x
  3. Step 3: Cross multiply
    512.75x = 707.60 × 279.88
  4. Step 4: Simplify right side
    512.75x = 198,043.09
  5. Step 5: Solve for x
    x = 198,043.09/512.75
  6. Step 6: Final answer
    x = 386.24

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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.