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Finding the Fourth Proportional to 243.71, 336.34 and 138.81

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Solution

The fourth proportional to 243.71, 336.34 and 138.81 is: 191.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.71 : 336.34 = 138.81 : x
  2. Step 2: Convert to fraction form
    243.71/336.34 = 138.81/x
  3. Step 3: Cross multiply
    243.71x = 336.34 × 138.81
  4. Step 4: Simplify right side
    243.71x = 46,688.79
  5. Step 5: Solve for x
    x = 46,688.79/243.71
  6. Step 6: Final answer
    x = 191.57

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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.