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Finding the Fourth Proportional to 131.65, 181.71 and 120.49

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Solution

The fourth proportional to 131.65, 181.71 and 120.49 is: 166.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.65 : 181.71 = 120.49 : x
  2. Step 2: Convert to fraction form
    131.65/181.71 = 120.49/x
  3. Step 3: Cross multiply
    131.65x = 181.71 × 120.49
  4. Step 4: Simplify right side
    131.65x = 21,893.78
  5. Step 5: Solve for x
    x = 21,893.78/131.65
  6. Step 6: Final answer
    x = 166.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.