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Finding the Fourth Proportional to 879.21, 1,213.29 and 506.31

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Solution

The fourth proportional to 879.21, 1,213.29 and 506.31 is: 698.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.21 : 1,213.29 = 506.31 : x
  2. Step 2: Convert to fraction form
    879.21/1,213.29 = 506.31/x
  3. Step 3: Cross multiply
    879.21x = 1,213.29 × 506.31
  4. Step 4: Simplify right side
    879.21x = 614,300.86
  5. Step 5: Solve for x
    x = 614,300.86/879.21
  6. Step 6: Final answer
    x = 698.70

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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.