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Finding the Fourth Proportional to 216.66, 298.94 and 129.27

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Solution

The fourth proportional to 216.66, 298.94 and 129.27 is: 178.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.66 : 298.94 = 129.27 : x
  2. Step 2: Convert to fraction form
    216.66/298.94 = 129.27/x
  3. Step 3: Cross multiply
    216.66x = 298.94 × 129.27
  4. Step 4: Simplify right side
    216.66x = 38,643.33
  5. Step 5: Solve for x
    x = 38,643.33/216.66
  6. Step 6: Final answer
    x = 178.36

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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.