Home / 13,855.40-19,115.71-7,885.57

Finding the Fourth Proportional to 13,855.40, 19,115.71 and 7,885.57

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Solution

The fourth proportional to 13,855.40, 19,115.71 and 7,885.57 is: 10,879.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,855.40 : 19,115.71 = 7,885.57 : x
  2. Step 2: Convert to fraction form
    13,855.40/19,115.71 = 7,885.57/x
  3. Step 3: Cross multiply
    13,855.40x = 19,115.71 × 7,885.57
  4. Step 4: Simplify right side
    13,855.40x = 150,738,269.30
  5. Step 5: Solve for x
    x = 150,738,269.30/13,855.40
  6. Step 6: Final answer
    x = 10,879.39

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1.5x scale

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.