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Finding the Fourth Proportional to 218.78, 301.62 and 187.56

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Solution

The fourth proportional to 218.78, 301.62 and 187.56 is: 258.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.78 : 301.62 = 187.56 : x
  2. Step 2: Convert to fraction form
    218.78/301.62 = 187.56/x
  3. Step 3: Cross multiply
    218.78x = 301.62 × 187.56
  4. Step 4: Simplify right side
    218.78x = 56,572.55
  5. Step 5: Solve for x
    x = 56,572.55/218.78
  6. Step 6: Final answer
    x = 258.58

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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.