Home / 20,928.16-28,881.12-11,976.45

Finding the Fourth Proportional to 20,928.16, 28,881.12 and 11,976.45

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Solution

The fourth proportional to 20,928.16, 28,881.12 and 11,976.45 is: 16,527.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.16 : 28,881.12 = 11,976.45 : x
  2. Step 2: Convert to fraction form
    20,928.16/28,881.12 = 11,976.45/x
  3. Step 3: Cross multiply
    20,928.16x = 28,881.12 × 11,976.45
  4. Step 4: Simplify right side
    20,928.16x = 345,893,289.62
  5. Step 5: Solve for x
    x = 345,893,289.62/20,928.16
  6. Step 6: Final answer
    x = 16,527.65

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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.