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Finding the Fourth Proportional to 238.94, 358.33 and 84.78

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Solution

The fourth proportional to 238.94, 358.33 and 84.78 is: 127.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.94 : 358.33 = 84.78 : x
  2. Step 2: Convert to fraction form
    238.94/358.33 = 84.78/x
  3. Step 3: Cross multiply
    238.94x = 358.33 × 84.78
  4. Step 4: Simplify right side
    238.94x = 30,379.22
  5. Step 5: Solve for x
    x = 30,379.22/238.94
  6. Step 6: Final answer
    x = 127.14

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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.