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Finding the Fourth Proportional to 879.39, 1,213.60 and 506.42

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Solution

The fourth proportional to 879.39, 1,213.60 and 506.42 is: 698.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.39 : 1,213.60 = 506.42 : x
  2. Step 2: Convert to fraction form
    879.39/1,213.60 = 506.42/x
  3. Step 3: Cross multiply
    879.39x = 1,213.60 × 506.42
  4. Step 4: Simplify right side
    879.39x = 614,593.96
  5. Step 5: Solve for x
    x = 614,593.96/879.39
  6. Step 6: Final answer
    x = 698.89

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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.