Home / 5,629.20-7,768.80-3,111.90

Finding the Fourth Proportional to 5,629.20, 7,768.80 and 3,111.90

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Solution

The fourth proportional to 5,629.20, 7,768.80 and 3,111.90 is: 4,294.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,629.20 : 7,768.80 = 3,111.90 : x
  2. Step 2: Convert to fraction form
    5,629.20/7,768.80 = 3,111.90/x
  3. Step 3: Cross multiply
    5,629.20x = 7,768.80 × 3,111.90
  4. Step 4: Simplify right side
    5,629.20x = 24,175,728.72
  5. Step 5: Solve for x
    x = 24,175,728.72/5,629.20
  6. Step 6: Final answer
    x = 4,294.70

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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.