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Finding the Fourth Proportional to 216.40, 298.38 and 191.80

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Solution

The fourth proportional to 216.40, 298.38 and 191.80 is: 264.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.40 : 298.38 = 191.80 : x
  2. Step 2: Convert to fraction form
    216.40/298.38 = 191.80/x
  3. Step 3: Cross multiply
    216.40x = 298.38 × 191.80
  4. Step 4: Simplify right side
    216.40x = 57,229.28
  5. Step 5: Solve for x
    x = 57,229.28/216.40
  6. Step 6: Final answer
    x = 264.46

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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.