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Finding the Fourth Proportional to 161.92, 242.96 and 128.04

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Solution

The fourth proportional to 161.92, 242.96 and 128.04 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.92 : 242.96 = 128.04 : x
  2. Step 2: Convert to fraction form
    161.92/242.96 = 128.04/x
  3. Step 3: Cross multiply
    161.92x = 242.96 × 128.04
  4. Step 4: Simplify right side
    161.92x = 31,108.60
  5. Step 5: Solve for x
    x = 31,108.60/161.92
  6. Step 6: Final answer
    x = 192.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.