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Finding the Fourth Proportional to 221, 304.98 and 138.05

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Solution

The fourth proportional to 221, 304.98 and 138.05 is: 190.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    221 : 304.98 = 138.05 : x
  2. Step 2: Convert to fraction form
    221/304.98 = 138.05/x
  3. Step 3: Cross multiply
    221x = 304.98 × 138.05
  4. Step 4: Simplify right side
    221x = 42,102.49
  5. Step 5: Solve for x
    x = 42,102.49/221
  6. Step 6: Final answer
    x = 190.51

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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.