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Finding the Fourth Proportional to 161.02, 241.32 and 79.78

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Solution

The fourth proportional to 161.02, 241.32 and 79.78 is: 119.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.02 : 241.32 = 79.78 : x
  2. Step 2: Convert to fraction form
    161.02/241.32 = 79.78/x
  3. Step 3: Cross multiply
    161.02x = 241.32 × 79.78
  4. Step 4: Simplify right side
    161.02x = 19,252.51
  5. Step 5: Solve for x
    x = 19,252.51/161.02
  6. Step 6: Final answer
    x = 119.57

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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.