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Finding the Fourth Proportional to 218.86, 301.89 and 153.34

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Solution

The fourth proportional to 218.86, 301.89 and 153.34 is: 211.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.86 : 301.89 = 153.34 : x
  2. Step 2: Convert to fraction form
    218.86/301.89 = 153.34/x
  3. Step 3: Cross multiply
    218.86x = 301.89 × 153.34
  4. Step 4: Simplify right side
    218.86x = 46,291.81
  5. Step 5: Solve for x
    x = 46,291.81/218.86
  6. Step 6: Final answer
    x = 211.51

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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.