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Finding the Fourth Proportional to 899.78, 1,241.45 and 506.78

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Solution

The fourth proportional to 899.78, 1,241.45 and 506.78 is: 699.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.78 : 1,241.45 = 506.78 : x
  2. Step 2: Convert to fraction form
    899.78/1,241.45 = 506.78/x
  3. Step 3: Cross multiply
    899.78x = 1,241.45 × 506.78
  4. Step 4: Simplify right side
    899.78x = 629,142.03
  5. Step 5: Solve for x
    x = 629,142.03/899.78
  6. Step 6: Final answer
    x = 699.22

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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.