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Finding the Fourth Proportional to 218.84, 301.95 and 148.78

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Solution

The fourth proportional to 218.84, 301.95 and 148.78 is: 205.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.84 : 301.95 = 148.78 : x
  2. Step 2: Convert to fraction form
    218.84/301.95 = 148.78/x
  3. Step 3: Cross multiply
    218.84x = 301.95 × 148.78
  4. Step 4: Simplify right side
    218.84x = 44,923.37
  5. Step 5: Solve for x
    x = 44,923.37/218.84
  6. Step 6: Final answer
    x = 205.28

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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.