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Finding the Fourth Proportional to 671.86, 1,007.12 and 238.78

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Solution

The fourth proportional to 671.86, 1,007.12 and 238.78 is: 357.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.86 : 1,007.12 = 238.78 : x
  2. Step 2: Convert to fraction form
    671.86/1,007.12 = 238.78/x
  3. Step 3: Cross multiply
    671.86x = 1,007.12 × 238.78
  4. Step 4: Simplify right side
    671.86x = 240,480.11
  5. Step 5: Solve for x
    x = 240,480.11/671.86
  6. Step 6: Final answer
    x = 357.93

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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.