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Finding the Fourth Proportional to 162.65, 243.86 and 81.43

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Solution

The fourth proportional to 162.65, 243.86 and 81.43 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.65 : 243.86 = 81.43 : x
  2. Step 2: Convert to fraction form
    162.65/243.86 = 81.43/x
  3. Step 3: Cross multiply
    162.65x = 243.86 × 81.43
  4. Step 4: Simplify right side
    162.65x = 19,858.18
  5. Step 5: Solve for x
    x = 19,858.18/162.65
  6. Step 6: Final answer
    x = 122.09

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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.