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Finding the Fourth Proportional to 451.81, 677.78 and 191.81

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Solution

The fourth proportional to 451.81, 677.78 and 191.81 is: 287.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.81 : 677.78 = 191.81 : x
  2. Step 2: Convert to fraction form
    451.81/677.78 = 191.81/x
  3. Step 3: Cross multiply
    451.81x = 677.78 × 191.81
  4. Step 4: Simplify right side
    451.81x = 130,003.29
  5. Step 5: Solve for x
    x = 130,003.29/451.81
  6. Step 6: Final answer
    x = 287.74

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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.