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Finding the Fourth Proportional to 451.78, 677.63 and 191.66

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Solution

The fourth proportional to 451.78, 677.63 and 191.66 is: 287.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.78 : 677.63 = 191.66 : x
  2. Step 2: Convert to fraction form
    451.78/677.63 = 191.66/x
  3. Step 3: Cross multiply
    451.78x = 677.63 × 191.66
  4. Step 4: Simplify right side
    451.78x = 129,873.61
  5. Step 5: Solve for x
    x = 129,873.61/451.78
  6. Step 6: Final answer
    x = 287.47

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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.