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Finding the Fourth Proportional to 161.40, 222.70 and 92.40

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Solution

The fourth proportional to 161.40, 222.70 and 92.40 is: 127.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.40 : 222.70 = 92.40 : x
  2. Step 2: Convert to fraction form
    161.40/222.70 = 92.40/x
  3. Step 3: Cross multiply
    161.40x = 222.70 × 92.40
  4. Step 4: Simplify right side
    161.40x = 20,577.48
  5. Step 5: Solve for x
    x = 20,577.48/161.40
  6. Step 6: Final answer
    x = 127.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.