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Finding the Fourth Proportional to 13,415.10, 20,101.05 and 11,211.90

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Solution

The fourth proportional to 13,415.10, 20,101.05 and 11,211.90 is: 16,799.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.10 : 20,101.05 = 11,211.90 : x
  2. Step 2: Convert to fraction form
    13,415.10/20,101.05 = 11,211.90/x
  3. Step 3: Cross multiply
    13,415.10x = 20,101.05 × 11,211.90
  4. Step 4: Simplify right side
    13,415.10x = 225,370,962.50
  5. Step 5: Solve for x
    x = 225,370,962.50/13,415.10
  6. Step 6: Final answer
    x = 16,799.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.