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Finding the Fourth Proportional to 393,398.96, 542,892.36 and 223,668.56

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Solution

The fourth proportional to 393,398.96, 542,892.36 and 223,668.56 is: 308,663.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,398.96 : 542,892.36 = 223,668.56 : x
  2. Step 2: Convert to fraction form
    393,398.96/542,892.36 = 223,668.56/x
  3. Step 3: Cross multiply
    393,398.96x = 542,892.36 × 223,668.56
  4. Step 4: Simplify right side
    393,398.96x = 121,427,952,396.20
  5. Step 5: Solve for x
    x = 121,427,952,396.20/393,398.96
  6. Step 6: Final answer
    x = 308,663.63

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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.