Home / 5,638.94-7,781.75-3,121.16

Finding the Fourth Proportional to 5,638.94, 7,781.75 and 3,121.16

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Solution

The fourth proportional to 5,638.94, 7,781.75 and 3,121.16 is: 4,307.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.94 : 7,781.75 = 3,121.16 : x
  2. Step 2: Convert to fraction form
    5,638.94/7,781.75 = 3,121.16/x
  3. Step 3: Cross multiply
    5,638.94x = 7,781.75 × 3,121.16
  4. Step 4: Simplify right side
    5,638.94x = 24,288,086.83
  5. Step 5: Solve for x
    x = 24,288,086.83/5,638.94
  6. Step 6: Final answer
    x = 4,307.21

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1.5x scale

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.