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Finding the Fourth Proportional to 222.50, 306.90 and 139.50

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Solution

The fourth proportional to 222.50, 306.90 and 139.50 is: 192.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.50 : 306.90 = 139.50 : x
  2. Step 2: Convert to fraction form
    222.50/306.90 = 139.50/x
  3. Step 3: Cross multiply
    222.50x = 306.90 × 139.50
  4. Step 4: Simplify right side
    222.50x = 42,811.88
  5. Step 5: Solve for x
    x = 42,811.88/222.50
  6. Step 6: Final answer
    x = 192.42

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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.