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Finding the Fourth Proportional to 20,850.70, 28,774.20 and 11,899.40

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Solution

The fourth proportional to 20,850.70, 28,774.20 and 11,899.40 is: 16,421.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,850.70 : 28,774.20 = 11,899.40 : x
  2. Step 2: Convert to fraction form
    20,850.70/28,774.20 = 11,899.40/x
  3. Step 3: Cross multiply
    20,850.70x = 28,774.20 × 11,899.40
  4. Step 4: Simplify right side
    20,850.70x = 342,395,715.48
  5. Step 5: Solve for x
    x = 342,395,715.48/20,850.70
  6. Step 6: Final answer
    x = 16,421.31

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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.