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Finding the Fourth Proportional to 671.61, 1,007.00 and 209.26

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Solution

The fourth proportional to 671.61, 1,007.00 and 209.26 is: 313.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.61 : 1,007.00 = 209.26 : x
  2. Step 2: Convert to fraction form
    671.61/1,007.00 = 209.26/x
  3. Step 3: Cross multiply
    671.61x = 1,007.00 × 209.26
  4. Step 4: Simplify right side
    671.61x = 210,718.74
  5. Step 5: Solve for x
    x = 210,718.74/671.61
  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.