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Finding the Fourth Proportional to 222.88, 307.44 and 138.80

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Solution

The fourth proportional to 222.88, 307.44 and 138.80 is: 191.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.88 : 307.44 = 138.80 : x
  2. Step 2: Convert to fraction form
    222.88/307.44 = 138.80/x
  3. Step 3: Cross multiply
    222.88x = 307.44 × 138.80
  4. Step 4: Simplify right side
    222.88x = 42,672.67
  5. Step 5: Solve for x
    x = 42,672.67/222.88
  6. Step 6: Final answer
    x = 191.46

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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.