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Finding the Fourth Proportional to 218.34, 301.40 and 135.53

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Solution

The fourth proportional to 218.34, 301.40 and 135.53 is: 187.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.34 : 301.40 = 135.53 : x
  2. Step 2: Convert to fraction form
    218.34/301.40 = 135.53/x
  3. Step 3: Cross multiply
    218.34x = 301.40 × 135.53
  4. Step 4: Simplify right side
    218.34x = 40,848.74
  5. Step 5: Solve for x
    x = 40,848.74/218.34
  6. Step 6: Final answer
    x = 187.09

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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.