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Finding the Fourth Proportional to 253.42, 349.31 and 218.25

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Solution

The fourth proportional to 253.42, 349.31 and 218.25 is: 300.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.42 : 349.31 = 218.25 : x
  2. Step 2: Convert to fraction form
    253.42/349.31 = 218.25/x
  3. Step 3: Cross multiply
    253.42x = 349.31 × 218.25
  4. Step 4: Simplify right side
    253.42x = 76,237.45
  5. Step 5: Solve for x
    x = 76,237.45/253.42
  6. Step 6: Final answer
    x = 300.84

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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.