Home / 10,919.58-16,379.28-3,128.40

Finding the Fourth Proportional to 10,919.58, 16,379.28 and 3,128.40

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Solution

The fourth proportional to 10,919.58, 16,379.28 and 3,128.40 is: 4,692.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,919.58 : 16,379.28 = 3,128.40 : x
  2. Step 2: Convert to fraction form
    10,919.58/16,379.28 = 3,128.40/x
  3. Step 3: Cross multiply
    10,919.58x = 16,379.28 × 3,128.40
  4. Step 4: Simplify right side
    10,919.58x = 51,240,939.55
  5. Step 5: Solve for x
    x = 51,240,939.55/10,919.58
  6. Step 6: Final answer
    x = 4,692.57

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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.