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Finding the Fourth Proportional to 238.40, 328.94 and 143.83

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Solution

The fourth proportional to 238.40, 328.94 and 143.83 is: 198.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.40 : 328.94 = 143.83 : x
  2. Step 2: Convert to fraction form
    238.40/328.94 = 143.83/x
  3. Step 3: Cross multiply
    238.40x = 328.94 × 143.83
  4. Step 4: Simplify right side
    238.40x = 47,311.44
  5. Step 5: Solve for x
    x = 47,311.44/238.40
  6. Step 6: Final answer
    x = 198.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.