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Finding the Fourth Proportional to 786.78, 1,180.20 and 238.92

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Solution

The fourth proportional to 786.78, 1,180.20 and 238.92 is: 358.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.78 : 1,180.20 = 238.92 : x
  2. Step 2: Convert to fraction form
    786.78/1,180.20 = 238.92/x
  3. Step 3: Cross multiply
    786.78x = 1,180.20 × 238.92
  4. Step 4: Simplify right side
    786.78x = 281,973.38
  5. Step 5: Solve for x
    x = 281,973.38/786.78
  6. Step 6: Final answer
    x = 358.39

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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.