Home / 13,890.85-20,811.97-11,565.80

Finding the Fourth Proportional to 13,890.85, 20,811.97 and 11,565.80

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Solution

The fourth proportional to 13,890.85, 20,811.97 and 11,565.80 is: 17,328.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.85 : 20,811.97 = 11,565.80 : x
  2. Step 2: Convert to fraction form
    13,890.85/20,811.97 = 11,565.80/x
  3. Step 3: Cross multiply
    13,890.85x = 20,811.97 × 11,565.80
  4. Step 4: Simplify right side
    13,890.85x = 240,707,082.63
  5. Step 5: Solve for x
    x = 240,707,082.63/13,890.85
  6. Step 6: Final answer
    x = 17,328.46

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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.