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Finding the Fourth Proportional to 217.55, 300.22 and 139.93

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Solution

The fourth proportional to 217.55, 300.22 and 139.93 is: 193.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.55 : 300.22 = 139.93 : x
  2. Step 2: Convert to fraction form
    217.55/300.22 = 139.93/x
  3. Step 3: Cross multiply
    217.55x = 300.22 × 139.93
  4. Step 4: Simplify right side
    217.55x = 42,008.68
  5. Step 5: Solve for x
    x = 42,008.68/217.55
  6. Step 6: Final answer
    x = 193.10

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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.