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Finding the Fourth Proportional to 671.45, 1,007.06 and 209.15

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Solution

The fourth proportional to 671.45, 1,007.06 and 209.15 is: 313.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.45 : 1,007.06 = 209.15 : x
  2. Step 2: Convert to fraction form
    671.45/1,007.06 = 209.15/x
  3. Step 3: Cross multiply
    671.45x = 1,007.06 × 209.15
  4. Step 4: Simplify right side
    671.45x = 210,620.52
  5. Step 5: Solve for x
    x = 210,620.52/671.45
  6. Step 6: Final answer
    x = 313.68

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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.