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Finding the Fourth Proportional to 218.17, 300.76 and 139.48

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Solution

The fourth proportional to 218.17, 300.76 and 139.48 is: 192.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.17 : 300.76 = 139.48 : x
  2. Step 2: Convert to fraction form
    218.17/300.76 = 139.48/x
  3. Step 3: Cross multiply
    218.17x = 300.76 × 139.48
  4. Step 4: Simplify right side
    218.17x = 41,949.11
  5. Step 5: Solve for x
    x = 41,949.11/218.17
  6. Step 6: Final answer
    x = 192.27

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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.