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Finding the Fourth Proportional to 671.46, 1,007.29 and 209.15

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Solution

The fourth proportional to 671.46, 1,007.29 and 209.15 is: 313.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.46 : 1,007.29 = 209.15 : x
  2. Step 2: Convert to fraction form
    671.46/1,007.29 = 209.15/x
  3. Step 3: Cross multiply
    671.46x = 1,007.29 × 209.15
  4. Step 4: Simplify right side
    671.46x = 210,672.53
  5. Step 5: Solve for x
    x = 210,672.53/671.46
  6. Step 6: Final answer
    x = 313.75

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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.