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Finding the Fourth Proportional to 389,989.44, 538,181.28 and 220,213.44

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Solution

The fourth proportional to 389,989.44, 538,181.28 and 220,213.44 is: 303,892.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,989.44 : 538,181.28 = 220,213.44 : x
  2. Step 2: Convert to fraction form
    389,989.44/538,181.28 = 220,213.44/x
  3. Step 3: Cross multiply
    389,989.44x = 538,181.28 × 220,213.44
  4. Step 4: Simplify right side
    389,989.44x = 118,514,751,012.40
  5. Step 5: Solve for x
    x = 118,514,751,012.40/389,989.44
  6. Step 6: Final answer
    x = 303,892.21

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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.