Home / 20,811.51-28,720.40-11,380.77

Finding the Fourth Proportional to 20,811.51, 28,720.40 and 11,380.77

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Solution

The fourth proportional to 20,811.51, 28,720.40 and 11,380.77 is: 15,705.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.51 : 28,720.40 = 11,380.77 : x
  2. Step 2: Convert to fraction form
    20,811.51/28,720.40 = 11,380.77/x
  3. Step 3: Cross multiply
    20,811.51x = 28,720.40 × 11,380.77
  4. Step 4: Simplify right side
    20,811.51x = 326,860,209.80
  5. Step 5: Solve for x
    x = 326,860,209.80/20,811.51
  6. Step 6: Final answer
    x = 15,705.74

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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.