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Finding the Fourth Proportional to 222.34, 306.64 and 139.40

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Solution

The fourth proportional to 222.34, 306.64 and 139.40 is: 192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.34 : 306.64 = 139.40 : x
  2. Step 2: Convert to fraction form
    222.34/306.64 = 139.40/x
  3. Step 3: Cross multiply
    222.34x = 306.64 × 139.40
  4. Step 4: Simplify right side
    222.34x = 42,745.62
  5. Step 5: Solve for x
    x = 42,745.62/222.34
  6. Step 6: Final answer
    x = 192.25

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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.