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Finding the Fourth Proportional to 451.77, 677.75 and 208.55

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Solution

The fourth proportional to 451.77, 677.75 and 208.55 is: 312.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.77 : 677.75 = 208.55 : x
  2. Step 2: Convert to fraction form
    451.77/677.75 = 208.55/x
  3. Step 3: Cross multiply
    451.77x = 677.75 × 208.55
  4. Step 4: Simplify right side
    451.77x = 141,340.33
  5. Step 5: Solve for x
    x = 141,340.33/451.77
  6. Step 6: Final answer
    x = 312.86

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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.