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Finding the Fourth Proportional to 671.58, 1,007.20 and 260.61

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Solution

The fourth proportional to 671.58, 1,007.20 and 260.61 is: 390.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.58 : 1,007.20 = 260.61 : x
  2. Step 2: Convert to fraction form
    671.58/1,007.20 = 260.61/x
  3. Step 3: Cross multiply
    671.58x = 1,007.20 × 260.61
  4. Step 4: Simplify right side
    671.58x = 262,486.39
  5. Step 5: Solve for x
    x = 262,486.39/671.58
  6. Step 6: Final answer
    x = 390.85

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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.