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Finding the Fourth Proportional to 786.72, 1,179.62 and 238.74

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Solution

The fourth proportional to 786.72, 1,179.62 and 238.74 is: 357.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.72 : 1,179.62 = 238.74 : x
  2. Step 2: Convert to fraction form
    786.72/1,179.62 = 238.74/x
  3. Step 3: Cross multiply
    786.72x = 1,179.62 × 238.74
  4. Step 4: Simplify right side
    786.72x = 281,622.48
  5. Step 5: Solve for x
    x = 281,622.48/786.72
  6. Step 6: Final answer
    x = 357.97

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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.