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Finding the Fourth Proportional to 515.78, 773.21 and 186.66

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Solution

The fourth proportional to 515.78, 773.21 and 186.66 is: 279.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.78 : 773.21 = 186.66 : x
  2. Step 2: Convert to fraction form
    515.78/773.21 = 186.66/x
  3. Step 3: Cross multiply
    515.78x = 773.21 × 186.66
  4. Step 4: Simplify right side
    515.78x = 144,326.45
  5. Step 5: Solve for x
    x = 144,326.45/515.78
  6. Step 6: Final answer
    x = 279.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.