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Finding the Fourth Proportional to 879.55, 1,213.64 and 506.54

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Solution

The fourth proportional to 879.55, 1,213.64 and 506.54 is: 698.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.55 : 1,213.64 = 506.54 : x
  2. Step 2: Convert to fraction form
    879.55/1,213.64 = 506.54/x
  3. Step 3: Cross multiply
    879.55x = 1,213.64 × 506.54
  4. Step 4: Simplify right side
    879.55x = 614,757.71
  5. Step 5: Solve for x
    x = 614,757.71/879.55
  6. Step 6: Final answer
    x = 698.95

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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.