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Finding the Fourth Proportional to 13,457.80, 20,169.90 and 6,886.60

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Solution

The fourth proportional to 13,457.80, 20,169.90 and 6,886.60 is: 10,321.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,457.80 : 20,169.90 = 6,886.60 : x
  2. Step 2: Convert to fraction form
    13,457.80/20,169.90 = 6,886.60/x
  3. Step 3: Cross multiply
    13,457.80x = 20,169.90 × 6,886.60
  4. Step 4: Simplify right side
    13,457.80x = 138,902,033.34
  5. Step 5: Solve for x
    x = 138,902,033.34/13,457.80
  6. Step 6: Final answer
    x = 10,321.30

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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.