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Finding the Fourth Proportional to 275.07, 412.39 and 120.91

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Solution

The fourth proportional to 275.07, 412.39 and 120.91 is: 181.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.07 : 412.39 = 120.91 : x
  2. Step 2: Convert to fraction form
    275.07/412.39 = 120.91/x
  3. Step 3: Cross multiply
    275.07x = 412.39 × 120.91
  4. Step 4: Simplify right side
    275.07x = 49,862.07
  5. Step 5: Solve for x
    x = 49,862.07/275.07
  6. Step 6: Final answer
    x = 181.27

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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.