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Finding the Fourth Proportional to 161.21, 241.81 and 39.47

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Solution

The fourth proportional to 161.21, 241.81 and 39.47 is: 59.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.21 : 241.81 = 39.47 : x
  2. Step 2: Convert to fraction form
    161.21/241.81 = 39.47/x
  3. Step 3: Cross multiply
    161.21x = 241.81 × 39.47
  4. Step 4: Simplify right side
    161.21x = 9,545.25
  5. Step 5: Solve for x
    x = 9,545.25/161.21
  6. Step 6: Final answer
    x = 59.21

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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.