Home / 6,919.86-10,381.55-1,989.39

Finding the Fourth Proportional to 6,919.86, 10,381.55 and 1,989.39

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Solution

The fourth proportional to 6,919.86, 10,381.55 and 1,989.39 is: 2,984.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,919.86 : 10,381.55 = 1,989.39 : x
  2. Step 2: Convert to fraction form
    6,919.86/10,381.55 = 1,989.39/x
  3. Step 3: Cross multiply
    6,919.86x = 10,381.55 × 1,989.39
  4. Step 4: Simplify right side
    6,919.86x = 20,652,941.81
  5. Step 5: Solve for x
    x = 20,652,941.81/6,919.86
  6. Step 6: Final answer
    x = 2,984.59

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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.