Home / 20,816.80-28,727.18-11,385.32

Finding the Fourth Proportional to 20,816.80, 28,727.18 and 11,385.32

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Solution

The fourth proportional to 20,816.80, 28,727.18 and 11,385.32 is: 15,711.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.80 : 28,727.18 = 11,385.32 : x
  2. Step 2: Convert to fraction form
    20,816.80/28,727.18 = 11,385.32/x
  3. Step 3: Cross multiply
    20,816.80x = 28,727.18 × 11,385.32
  4. Step 4: Simplify right side
    20,816.80x = 327,068,137.00
  5. Step 5: Solve for x
    x = 327,068,137.00/20,816.80
  6. Step 6: Final answer
    x = 15,711.74

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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.