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Finding the Fourth Proportional to 218.78, 302.02 and 141.20

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Solution

The fourth proportional to 218.78, 302.02 and 141.20 is: 194.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.78 : 302.02 = 141.20 : x
  2. Step 2: Convert to fraction form
    218.78/302.02 = 141.20/x
  3. Step 3: Cross multiply
    218.78x = 302.02 × 141.20
  4. Step 4: Simplify right side
    218.78x = 42,645.22
  5. Step 5: Solve for x
    x = 42,645.22/218.78
  6. Step 6: Final answer
    x = 194.92

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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.