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Finding the Fourth Proportional to 243.90, 336.56 and 138.98

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Solution

The fourth proportional to 243.90, 336.56 and 138.98 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.90 : 336.56 = 138.98 : x
  2. Step 2: Convert to fraction form
    243.90/336.56 = 138.98/x
  3. Step 3: Cross multiply
    243.90x = 336.56 × 138.98
  4. Step 4: Simplify right side
    243.90x = 46,775.11
  5. Step 5: Solve for x
    x = 46,775.11/243.90
  6. Step 6: Final answer
    x = 191.78

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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.