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Finding the Fourth Proportional to 222.84, 307.36 and 138.84

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Solution

The fourth proportional to 222.84, 307.36 and 138.84 is: 191.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.84 : 307.36 = 138.84 : x
  2. Step 2: Convert to fraction form
    222.84/307.36 = 138.84/x
  3. Step 3: Cross multiply
    222.84x = 307.36 × 138.84
  4. Step 4: Simplify right side
    222.84x = 42,673.86
  5. Step 5: Solve for x
    x = 42,673.86/222.84
  6. Step 6: Final answer
    x = 191.50

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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.