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Finding the Fourth Proportional to 217.30, 299.77 and 139.63

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Solution

The fourth proportional to 217.30, 299.77 and 139.63 is: 192.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.30 : 299.77 = 139.63 : x
  2. Step 2: Convert to fraction form
    217.30/299.77 = 139.63/x
  3. Step 3: Cross multiply
    217.30x = 299.77 × 139.63
  4. Step 4: Simplify right side
    217.30x = 41,856.89
  5. Step 5: Solve for x
    x = 41,856.89/217.30
  6. Step 6: Final answer
    x = 192.62

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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.