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Finding the Fourth Proportional to 220.70, 304.69 and 154.28

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Solution

The fourth proportional to 220.70, 304.69 and 154.28 is: 212.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.70 : 304.69 = 154.28 : x
  2. Step 2: Convert to fraction form
    220.70/304.69 = 154.28/x
  3. Step 3: Cross multiply
    220.70x = 304.69 × 154.28
  4. Step 4: Simplify right side
    220.70x = 47,007.57
  5. Step 5: Solve for x
    x = 47,007.57/220.70
  6. Step 6: Final answer
    x = 212.99

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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.