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Finding the Fourth Proportional to 218.10, 301.06 and 139.48

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Solution

The fourth proportional to 218.10, 301.06 and 139.48 is: 192.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.10 : 301.06 = 139.48 : x
  2. Step 2: Convert to fraction form
    218.10/301.06 = 139.48/x
  3. Step 3: Cross multiply
    218.10x = 301.06 × 139.48
  4. Step 4: Simplify right side
    218.10x = 41,991.85
  5. Step 5: Solve for x
    x = 41,991.85/218.10
  6. Step 6: Final answer
    x = 192.53

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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.