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Finding the Fourth Proportional to 671.91, 1,007.14 and 260.93

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Solution

The fourth proportional to 671.91, 1,007.14 and 260.93 is: 391.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.91 : 1,007.14 = 260.93 : x
  2. Step 2: Convert to fraction form
    671.91/1,007.14 = 260.93/x
  3. Step 3: Cross multiply
    671.91x = 1,007.14 × 260.93
  4. Step 4: Simplify right side
    671.91x = 262,786.70
  5. Step 5: Solve for x
    x = 262,786.70/671.91
  6. Step 6: Final answer
    x = 391.10

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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.