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Finding the Fourth Proportional to 455.56, 682.98 and 208.66

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Solution

The fourth proportional to 455.56, 682.98 and 208.66 is: 312.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.56 : 682.98 = 208.66 : x
  2. Step 2: Convert to fraction form
    455.56/682.98 = 208.66/x
  3. Step 3: Cross multiply
    455.56x = 682.98 × 208.66
  4. Step 4: Simplify right side
    455.56x = 142,510.61
  5. Step 5: Solve for x
    x = 142,510.61/455.56
  6. Step 6: Final answer
    x = 312.83

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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.