Home / 20,811.76-28,720.24-11,381.20

Finding the Fourth Proportional to 20,811.76, 28,720.24 and 11,381.20

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Solution

The fourth proportional to 20,811.76, 28,720.24 and 11,381.20 is: 15,706.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.76 : 28,720.24 = 11,381.20 : x
  2. Step 2: Convert to fraction form
    20,811.76/28,720.24 = 11,381.20/x
  3. Step 3: Cross multiply
    20,811.76x = 28,720.24 × 11,381.20
  4. Step 4: Simplify right side
    20,811.76x = 326,870,795.49
  5. Step 5: Solve for x
    x = 326,870,795.49/20,811.76
  6. Step 6: Final answer
    x = 15,706.06

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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.