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Finding the Fourth Proportional to 816, 1,223.79 and 506.71

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Solution

The fourth proportional to 816, 1,223.79 and 506.71 is: 759.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    816 : 1,223.79 = 506.71 : x
  2. Step 2: Convert to fraction form
    816/1,223.79 = 506.71/x
  3. Step 3: Cross multiply
    816x = 1,223.79 × 506.71
  4. Step 4: Simplify right side
    816x = 620,106.63
  5. Step 5: Solve for x
    x = 620,106.63/816
  6. Step 6: Final answer
    x = 759.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.