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Finding the Fourth Proportional to 451.85, 677.95 and 208.49

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Solution

The fourth proportional to 451.85, 677.95 and 208.49 is: 312.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.85 : 677.95 = 208.49 : x
  2. Step 2: Convert to fraction form
    451.85/677.95 = 208.49/x
  3. Step 3: Cross multiply
    451.85x = 677.95 × 208.49
  4. Step 4: Simplify right side
    451.85x = 141,341.88
  5. Step 5: Solve for x
    x = 141,341.88/451.85
  6. Step 6: Final answer
    x = 312.81

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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.