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Finding the Fourth Proportional to 512.58, 707.36 and 279.70

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Solution

The fourth proportional to 512.58, 707.36 and 279.70 is: 385.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.58 : 707.36 = 279.70 : x
  2. Step 2: Convert to fraction form
    512.58/707.36 = 279.70/x
  3. Step 3: Cross multiply
    512.58x = 707.36 × 279.70
  4. Step 4: Simplify right side
    512.58x = 197,850.19
  5. Step 5: Solve for x
    x = 197,850.19/512.58
  6. Step 6: Final answer
    x = 385.99

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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.