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Finding the Fourth Proportional to 339.98, 469.25 and 221.75

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Solution

The fourth proportional to 339.98, 469.25 and 221.75 is: 306.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.98 : 469.25 = 221.75 : x
  2. Step 2: Convert to fraction form
    339.98/469.25 = 221.75/x
  3. Step 3: Cross multiply
    339.98x = 469.25 × 221.75
  4. Step 4: Simplify right side
    339.98x = 104,056.19
  5. Step 5: Solve for x
    x = 104,056.19/339.98
  6. Step 6: Final answer
    x = 306.07

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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.