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Finding the Fourth Proportional to 161.28, 222.30 and 143.64

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Solution

The fourth proportional to 161.28, 222.30 and 143.64 is: 197.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.28 : 222.30 = 143.64 : x
  2. Step 2: Convert to fraction form
    161.28/222.30 = 143.64/x
  3. Step 3: Cross multiply
    161.28x = 222.30 × 143.64
  4. Step 4: Simplify right side
    161.28x = 31,931.17
  5. Step 5: Solve for x
    x = 31,931.17/161.28
  6. Step 6: Final answer
    x = 197.99

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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.