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Finding the Fourth Proportional to 216.63, 298.89 and 139.02

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Solution

The fourth proportional to 216.63, 298.89 and 139.02 is: 191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.63 : 298.89 = 139.02 : x
  2. Step 2: Convert to fraction form
    216.63/298.89 = 139.02/x
  3. Step 3: Cross multiply
    216.63x = 298.89 × 139.02
  4. Step 4: Simplify right side
    216.63x = 41,551.69
  5. Step 5: Solve for x
    x = 41,551.69/216.63
  6. Step 6: Final answer
    x = 191.81

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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.