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Finding the Fourth Proportional to 671.82, 1,007.25 and 260.61

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Solution

The fourth proportional to 671.82, 1,007.25 and 260.61 is: 390.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.82 : 1,007.25 = 260.61 : x
  2. Step 2: Convert to fraction form
    671.82/1,007.25 = 260.61/x
  3. Step 3: Cross multiply
    671.82x = 1,007.25 × 260.61
  4. Step 4: Simplify right side
    671.82x = 262,494.39
  5. Step 5: Solve for x
    x = 262,494.39/671.82
  6. Step 6: Final answer
    x = 390.72

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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.