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Finding the Fourth Proportional to 161.40, 221.67 and 149.40

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Solution

The fourth proportional to 161.40, 221.67 and 149.40 is: 205.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.40 : 221.67 = 149.40 : x
  2. Step 2: Convert to fraction form
    161.40/221.67 = 149.40/x
  3. Step 3: Cross multiply
    161.40x = 221.67 × 149.40
  4. Step 4: Simplify right side
    161.40x = 33,117.50
  5. Step 5: Solve for x
    x = 33,117.50/161.40
  6. Step 6: Final answer
    x = 205.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.