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Finding the Fourth Proportional to 339.86, 469.21 and 223.63

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Solution

The fourth proportional to 339.86, 469.21 and 223.63 is: 308.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.86 : 469.21 = 223.63 : x
  2. Step 2: Convert to fraction form
    339.86/469.21 = 223.63/x
  3. Step 3: Cross multiply
    339.86x = 469.21 × 223.63
  4. Step 4: Simplify right side
    339.86x = 104,929.43
  5. Step 5: Solve for x
    x = 104,929.43/339.86
  6. Step 6: Final answer
    x = 308.74

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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.