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Finding the Fourth Proportional to 218.80, 302.08 and 135.98

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Solution

The fourth proportional to 218.80, 302.08 and 135.98 is: 187.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.80 : 302.08 = 135.98 : x
  2. Step 2: Convert to fraction form
    218.80/302.08 = 135.98/x
  3. Step 3: Cross multiply
    218.80x = 302.08 × 135.98
  4. Step 4: Simplify right side
    218.80x = 41,076.38
  5. Step 5: Solve for x
    x = 41,076.38/218.80
  6. Step 6: Final answer
    x = 187.73

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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.