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Finding the Fourth Proportional to 220.88, 304.89 and 138.13

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Solution

The fourth proportional to 220.88, 304.89 and 138.13 is: 190.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.88 : 304.89 = 138.13 : x
  2. Step 2: Convert to fraction form
    220.88/304.89 = 138.13/x
  3. Step 3: Cross multiply
    220.88x = 304.89 × 138.13
  4. Step 4: Simplify right side
    220.88x = 42,114.46
  5. Step 5: Solve for x
    x = 42,114.46/220.88
  6. Step 6: Final answer
    x = 190.67

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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.