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Finding the Fourth Proportional to 407.21, 610.81 and 114.73

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Solution

The fourth proportional to 407.21, 610.81 and 114.73 is: 172.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.21 : 610.81 = 114.73 : x
  2. Step 2: Convert to fraction form
    407.21/610.81 = 114.73/x
  3. Step 3: Cross multiply
    407.21x = 610.81 × 114.73
  4. Step 4: Simplify right side
    407.21x = 70,078.23
  5. Step 5: Solve for x
    x = 70,078.23/407.21
  6. Step 6: Final answer
    x = 172.09

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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.