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Finding the Fourth Proportional to 143.47, 197.88 and 117.28

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Solution

The fourth proportional to 143.47, 197.88 and 117.28 is: 161.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.47 : 197.88 = 117.28 : x
  2. Step 2: Convert to fraction form
    143.47/197.88 = 117.28/x
  3. Step 3: Cross multiply
    143.47x = 197.88 × 117.28
  4. Step 4: Simplify right side
    143.47x = 23,207.37
  5. Step 5: Solve for x
    x = 23,207.37/143.47
  6. Step 6: Final answer
    x = 161.76

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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.