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Finding the Fourth Proportional to 216.82, 299.20 and 129.50

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Solution

The fourth proportional to 216.82, 299.20 and 129.50 is: 178.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.82 : 299.20 = 129.50 : x
  2. Step 2: Convert to fraction form
    216.82/299.20 = 129.50/x
  3. Step 3: Cross multiply
    216.82x = 299.20 × 129.50
  4. Step 4: Simplify right side
    216.82x = 38,746.40
  5. Step 5: Solve for x
    x = 38,746.40/216.82
  6. Step 6: Final answer
    x = 178.70

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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.