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Finding the Fourth Proportional to 162.84, 243.96 and 81.74

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Solution

The fourth proportional to 162.84, 243.96 and 81.74 is: 122.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.84 : 243.96 = 81.74 : x
  2. Step 2: Convert to fraction form
    162.84/243.96 = 81.74/x
  3. Step 3: Cross multiply
    162.84x = 243.96 × 81.74
  4. Step 4: Simplify right side
    162.84x = 19,941.70
  5. Step 5: Solve for x
    x = 19,941.70/162.84
  6. Step 6: Final answer
    x = 122.46

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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.