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Finding the Fourth Proportional to 222.40, 306.90 and 139.48

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Solution

The fourth proportional to 222.40, 306.90 and 139.48 is: 192.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.40 : 306.90 = 139.48 : x
  2. Step 2: Convert to fraction form
    222.40/306.90 = 139.48/x
  3. Step 3: Cross multiply
    222.40x = 306.90 × 139.48
  4. Step 4: Simplify right side
    222.40x = 42,806.41
  5. Step 5: Solve for x
    x = 42,806.41/222.40
  6. Step 6: Final answer
    x = 192.47

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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.