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Finding the Fourth Proportional to 131.99, 181.38 and 108.63

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Solution

The fourth proportional to 131.99, 181.38 and 108.63 is: 149.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.99 : 181.38 = 108.63 : x
  2. Step 2: Convert to fraction form
    131.99/181.38 = 108.63/x
  3. Step 3: Cross multiply
    131.99x = 181.38 × 108.63
  4. Step 4: Simplify right side
    131.99x = 19,703.31
  5. Step 5: Solve for x
    x = 19,703.31/131.99
  6. Step 6: Final answer
    x = 149.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.