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Finding the Fourth Proportional to 218.28, 301.21 and 156.21

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Solution

The fourth proportional to 218.28, 301.21 and 156.21 is: 215.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.28 : 301.21 = 156.21 : x
  2. Step 2: Convert to fraction form
    218.28/301.21 = 156.21/x
  3. Step 3: Cross multiply
    218.28x = 301.21 × 156.21
  4. Step 4: Simplify right side
    218.28x = 47,052.50
  5. Step 5: Solve for x
    x = 47,052.50/218.28
  6. Step 6: Final answer
    x = 215.56

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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.