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Finding the Fourth Proportional to 220.76, 304.78 and 143.28

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Solution

The fourth proportional to 220.76, 304.78 and 143.28 is: 197.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.76 : 304.78 = 143.28 : x
  2. Step 2: Convert to fraction form
    220.76/304.78 = 143.28/x
  3. Step 3: Cross multiply
    220.76x = 304.78 × 143.28
  4. Step 4: Simplify right side
    220.76x = 43,668.88
  5. Step 5: Solve for x
    x = 43,668.88/220.76
  6. Step 6: Final answer
    x = 197.81

Related Problems

Find fourth proportional to 110.38, 152.39 and 71.64
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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.