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Finding the Fourth Proportional to 20,672.40, 31,008.60 and 11,778.60

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Solution

The fourth proportional to 20,672.40, 31,008.60 and 11,778.60 is: 17,667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.40 : 31,008.60 = 11,778.60 : x
  2. Step 2: Convert to fraction form
    20,672.40/31,008.60 = 11,778.60/x
  3. Step 3: Cross multiply
    20,672.40x = 31,008.60 × 11,778.60
  4. Step 4: Simplify right side
    20,672.40x = 365,237,895.96
  5. Step 5: Solve for x
    x = 365,237,895.96/20,672.40
  6. Step 6: Final answer
    x = 17,667.90

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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.