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Finding the Fourth Proportional to 218.99, 302.21 and 119.40

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Solution

The fourth proportional to 218.99, 302.21 and 119.40 is: 164.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.99 : 302.21 = 119.40 : x
  2. Step 2: Convert to fraction form
    218.99/302.21 = 119.40/x
  3. Step 3: Cross multiply
    218.99x = 302.21 × 119.40
  4. Step 4: Simplify right side
    218.99x = 36,084.41
  5. Step 5: Solve for x
    x = 36,084.41/218.99
  6. Step 6: Final answer
    x = 164.78

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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.