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Finding the Fourth Proportional to 20,783, 28,680.70 and 11,351.57

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Solution

The fourth proportional to 20,783, 28,680.70 and 11,351.57 is: 15,665.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783 : 28,680.70 = 11,351.57 : x
  2. Step 2: Convert to fraction form
    20,783/28,680.70 = 11,351.57/x
  3. Step 3: Cross multiply
    20,783x = 28,680.70 × 11,351.57
  4. Step 4: Simplify right side
    20,783x = 325,570,773.54
  5. Step 5: Solve for x
    x = 325,570,773.54/20,783
  6. Step 6: Final answer
    x = 15,665.24

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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.