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Finding the Fourth Proportional to 13,487.40, 20,231.10 and 12,666.60

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Solution

The fourth proportional to 13,487.40, 20,231.10 and 12,666.60 is: 18,999.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,487.40 : 20,231.10 = 12,666.60 : x
  2. Step 2: Convert to fraction form
    13,487.40/20,231.10 = 12,666.60/x
  3. Step 3: Cross multiply
    13,487.40x = 20,231.10 × 12,666.60
  4. Step 4: Simplify right side
    13,487.40x = 256,259,251.26
  5. Step 5: Solve for x
    x = 256,259,251.26/13,487.40
  6. Step 6: Final answer
    x = 18,999.90

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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.