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Finding the Fourth Proportional to 216.55, 298.87 and 129.22

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Solution

The fourth proportional to 216.55, 298.87 and 129.22 is: 178.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.55 : 298.87 = 129.22 : x
  2. Step 2: Convert to fraction form
    216.55/298.87 = 129.22/x
  3. Step 3: Cross multiply
    216.55x = 298.87 × 129.22
  4. Step 4: Simplify right side
    216.55x = 38,619.98
  5. Step 5: Solve for x
    x = 38,619.98/216.55
  6. Step 6: Final answer
    x = 178.34

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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.