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Finding the Fourth Proportional to 512.53, 707.30 and 279.66

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Solution

The fourth proportional to 512.53, 707.30 and 279.66 is: 385.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.53 : 707.30 = 279.66 : x
  2. Step 2: Convert to fraction form
    512.53/707.30 = 279.66/x
  3. Step 3: Cross multiply
    512.53x = 707.30 × 279.66
  4. Step 4: Simplify right side
    512.53x = 197,799.47
  5. Step 5: Solve for x
    x = 197,799.47/512.53
  6. Step 6: Final answer
    x = 385.93

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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.