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Finding the Fourth Proportional to 243.98, 336.72 and 139.11

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Solution

The fourth proportional to 243.98, 336.72 and 139.11 is: 191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.98 : 336.72 = 139.11 : x
  2. Step 2: Convert to fraction form
    243.98/336.72 = 139.11/x
  3. Step 3: Cross multiply
    243.98x = 336.72 × 139.11
  4. Step 4: Simplify right side
    243.98x = 46,841.12
  5. Step 5: Solve for x
    x = 46,841.12/243.98
  6. Step 6: Final answer
    x = 191.99

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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.