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Finding the Fourth Proportional to 162.93, 243.99 and 81.81

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Solution

The fourth proportional to 162.93, 243.99 and 81.81 is: 122.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.93 : 243.99 = 81.81 : x
  2. Step 2: Convert to fraction form
    162.93/243.99 = 81.81/x
  3. Step 3: Cross multiply
    162.93x = 243.99 × 81.81
  4. Step 4: Simplify right side
    162.93x = 19,960.82
  5. Step 5: Solve for x
    x = 19,960.82/162.93
  6. Step 6: Final answer
    x = 122.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.