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Finding the Fourth Proportional to 218.39, 301.47 and 155.41

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Solution

The fourth proportional to 218.39, 301.47 and 155.41 is: 214.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.39 : 301.47 = 155.41 : x
  2. Step 2: Convert to fraction form
    218.39/301.47 = 155.41/x
  3. Step 3: Cross multiply
    218.39x = 301.47 × 155.41
  4. Step 4: Simplify right side
    218.39x = 46,850.70
  5. Step 5: Solve for x
    x = 46,850.70/218.39
  6. Step 6: Final answer
    x = 214.53

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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.