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Finding the Fourth Proportional to 218.40, 301.43 and 135.54

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Solution

The fourth proportional to 218.40, 301.43 and 135.54 is: 187.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.40 : 301.43 = 135.54 : x
  2. Step 2: Convert to fraction form
    218.40/301.43 = 135.54/x
  3. Step 3: Cross multiply
    218.40x = 301.43 × 135.54
  4. Step 4: Simplify right side
    218.40x = 40,855.82
  5. Step 5: Solve for x
    x = 40,855.82/218.40
  6. Step 6: Final answer
    x = 187.07

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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.