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Finding the Fourth Proportional to 243.80, 336.44 and 138.90

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Solution

The fourth proportional to 243.80, 336.44 and 138.90 is: 191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.80 : 336.44 = 138.90 : x
  2. Step 2: Convert to fraction form
    243.80/336.44 = 138.90/x
  3. Step 3: Cross multiply
    243.80x = 336.44 × 138.90
  4. Step 4: Simplify right side
    243.80x = 46,731.52
  5. Step 5: Solve for x
    x = 46,731.52/243.80
  6. Step 6: Final answer
    x = 191.68

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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.