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Finding the Fourth Proportional to 243.55, 336.12 and 138.63

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Solution

The fourth proportional to 243.55, 336.12 and 138.63 is: 191.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.55 : 336.12 = 138.63 : x
  2. Step 2: Convert to fraction form
    243.55/336.12 = 138.63/x
  3. Step 3: Cross multiply
    243.55x = 336.12 × 138.63
  4. Step 4: Simplify right side
    243.55x = 46,596.32
  5. Step 5: Solve for x
    x = 46,596.32/243.55
  6. Step 6: Final answer
    x = 191.32

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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.