Home / 5,121.75-7,681.94-1,999.58

Finding the Fourth Proportional to 5,121.75, 7,681.94 and 1,999.58

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Solution

The fourth proportional to 5,121.75, 7,681.94 and 1,999.58 is: 2,999.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121.75 : 7,681.94 = 1,999.58 : x
  2. Step 2: Convert to fraction form
    5,121.75/7,681.94 = 1,999.58/x
  3. Step 3: Cross multiply
    5,121.75x = 7,681.94 × 1,999.58
  4. Step 4: Simplify right side
    5,121.75x = 15,360,605.18
  5. Step 5: Solve for x
    x = 15,360,605.18/5,121.75
  6. Step 6: Final answer
    x = 2,999.09

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1.5x scale

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.