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Finding the Fourth Proportional to 162.54, 243.79 and 71.21

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Solution

The fourth proportional to 162.54, 243.79 and 71.21 is: 106.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.54 : 243.79 = 71.21 : x
  2. Step 2: Convert to fraction form
    162.54/243.79 = 71.21/x
  3. Step 3: Cross multiply
    162.54x = 243.79 × 71.21
  4. Step 4: Simplify right side
    162.54x = 17,360.29
  5. Step 5: Solve for x
    x = 17,360.29/162.54
  6. Step 6: Final answer
    x = 106.81

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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.