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Finding the Fourth Proportional to 245.67, 368.42 and 81.11

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Solution

The fourth proportional to 245.67, 368.42 and 81.11 is: 121.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.67 : 368.42 = 81.11 : x
  2. Step 2: Convert to fraction form
    245.67/368.42 = 81.11/x
  3. Step 3: Cross multiply
    245.67x = 368.42 × 81.11
  4. Step 4: Simplify right side
    245.67x = 29,881.68
  5. Step 5: Solve for x
    x = 29,881.68/245.67
  6. Step 6: Final answer
    x = 121.63

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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.