Home / 6,920.96-10,381.09-1,990.55

Finding the Fourth Proportional to 6,920.96, 10,381.09 and 1,990.55

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Solution

The fourth proportional to 6,920.96, 10,381.09 and 1,990.55 is: 2,985.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,920.96 : 10,381.09 = 1,990.55 : x
  2. Step 2: Convert to fraction form
    6,920.96/10,381.09 = 1,990.55/x
  3. Step 3: Cross multiply
    6,920.96x = 10,381.09 × 1,990.55
  4. Step 4: Simplify right side
    6,920.96x = 20,664,078.70
  5. Step 5: Solve for x
    x = 20,664,078.70/6,920.96
  6. Step 6: Final answer
    x = 2,985.72

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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.