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Finding the Fourth Proportional to 671.38, 1,007.20 and 238.84

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Solution

The fourth proportional to 671.38, 1,007.20 and 238.84 is: 358.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.38 : 1,007.20 = 238.84 : x
  2. Step 2: Convert to fraction form
    671.38/1,007.20 = 238.84/x
  3. Step 3: Cross multiply
    671.38x = 1,007.20 × 238.84
  4. Step 4: Simplify right side
    671.38x = 240,559.65
  5. Step 5: Solve for x
    x = 240,559.65/671.38
  6. Step 6: Final answer
    x = 358.31

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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.