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Finding the Fourth Proportional to 393,310.96, 542,815.70 and 223,570.60

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Solution

The fourth proportional to 393,310.96, 542,815.70 and 223,570.60 is: 308,553.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,310.96 : 542,815.70 = 223,570.60 : x
  2. Step 2: Convert to fraction form
    393,310.96/542,815.70 = 223,570.60/x
  3. Step 3: Cross multiply
    393,310.96x = 542,815.70 × 223,570.60
  4. Step 4: Simplify right side
    393,310.96x = 121,357,631,738.42
  5. Step 5: Solve for x
    x = 121,357,631,738.42/393,310.96
  6. Step 6: Final answer
    x = 308,553.90

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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.