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Finding the Fourth Proportional to 161.07, 222.14 and 128.27

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Solution

The fourth proportional to 161.07, 222.14 and 128.27 is: 176.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.07 : 222.14 = 128.27 : x
  2. Step 2: Convert to fraction form
    161.07/222.14 = 128.27/x
  3. Step 3: Cross multiply
    161.07x = 222.14 × 128.27
  4. Step 4: Simplify right side
    161.07x = 28,492.15
  5. Step 5: Solve for x
    x = 28,492.15/161.07
  6. Step 6: Final answer
    x = 176.89

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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.