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Finding the Fourth Proportional to 671.49, 1,007.48 and 260.65

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Solution

The fourth proportional to 671.49, 1,007.48 and 260.65 is: 391.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.49 : 1,007.48 = 260.65 : x
  2. Step 2: Convert to fraction form
    671.49/1,007.48 = 260.65/x
  3. Step 3: Cross multiply
    671.49x = 1,007.48 × 260.65
  4. Step 4: Simplify right side
    671.49x = 262,594.62
  5. Step 5: Solve for x
    x = 262,594.62/671.49
  6. Step 6: Final answer
    x = 391.07

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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.