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Finding the Fourth Proportional to 216.70, 299.05 and 133.81

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Solution

The fourth proportional to 216.70, 299.05 and 133.81 is: 184.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.70 : 299.05 = 133.81 : x
  2. Step 2: Convert to fraction form
    216.70/299.05 = 133.81/x
  3. Step 3: Cross multiply
    216.70x = 299.05 × 133.81
  4. Step 4: Simplify right side
    216.70x = 40,014.80
  5. Step 5: Solve for x
    x = 40,014.80/216.70
  6. Step 6: Final answer
    x = 184.66

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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.