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Finding the Fourth Proportional to 218.98, 302.11 and 136.13

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Solution

The fourth proportional to 218.98, 302.11 and 136.13 is: 187.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.98 : 302.11 = 136.13 : x
  2. Step 2: Convert to fraction form
    218.98/302.11 = 136.13/x
  3. Step 3: Cross multiply
    218.98x = 302.11 × 136.13
  4. Step 4: Simplify right side
    218.98x = 41,124.38
  5. Step 5: Solve for x
    x = 41,124.38/218.98
  6. Step 6: Final answer
    x = 187.80

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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.