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Finding the Fourth Proportional to 671.21, 1,006.88 and 208.86

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Solution

The fourth proportional to 671.21, 1,006.88 and 208.86 is: 313.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.21 : 1,006.88 = 208.86 : x
  2. Step 2: Convert to fraction form
    671.21/1,006.88 = 208.86/x
  3. Step 3: Cross multiply
    671.21x = 1,006.88 × 208.86
  4. Step 4: Simplify right side
    671.21x = 210,296.96
  5. Step 5: Solve for x
    x = 210,296.96/671.21
  6. Step 6: Final answer
    x = 313.31

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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.