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Finding the Fourth Proportional to 238.40, 328.88 and 140.09

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Solution

The fourth proportional to 238.40, 328.88 and 140.09 is: 193.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.40 : 328.88 = 140.09 : x
  2. Step 2: Convert to fraction form
    238.40/328.88 = 140.09/x
  3. Step 3: Cross multiply
    238.40x = 328.88 × 140.09
  4. Step 4: Simplify right side
    238.40x = 46,070.45
  5. Step 5: Solve for x
    x = 46,070.45/238.40
  6. Step 6: Final answer
    x = 193.25

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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.