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Finding the Fourth Proportional to 512.87, 707.74 and 279.99

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Solution

The fourth proportional to 512.87, 707.74 and 279.99 is: 386.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.87 : 707.74 = 279.99 : x
  2. Step 2: Convert to fraction form
    512.87/707.74 = 279.99/x
  3. Step 3: Cross multiply
    512.87x = 707.74 × 279.99
  4. Step 4: Simplify right side
    512.87x = 198,159.42
  5. Step 5: Solve for x
    x = 198,159.42/512.87
  6. Step 6: Final answer
    x = 386.38

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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.