Home / 5,638.94-7,781.68-3,121.24

Finding the Fourth Proportional to 5,638.94, 7,781.68 and 3,121.24

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Solution

The fourth proportional to 5,638.94, 7,781.68 and 3,121.24 is: 4,307.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.94 : 7,781.68 = 3,121.24 : x
  2. Step 2: Convert to fraction form
    5,638.94/7,781.68 = 3,121.24/x
  3. Step 3: Cross multiply
    5,638.94x = 7,781.68 × 3,121.24
  4. Step 4: Simplify right side
    5,638.94x = 24,288,490.88
  5. Step 5: Solve for x
    x = 24,288,490.88/5,638.94
  6. Step 6: Final answer
    x = 4,307.28

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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.