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Finding the Fourth Proportional to 26,989.80, 40,419.90 and 13,122.60

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Solution

The fourth proportional to 26,989.80, 40,419.90 and 13,122.60 is: 19,652.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,989.80 : 40,419.90 = 13,122.60 : x
  2. Step 2: Convert to fraction form
    26,989.80/40,419.90 = 13,122.60/x
  3. Step 3: Cross multiply
    26,989.80x = 40,419.90 × 13,122.60
  4. Step 4: Simplify right side
    26,989.80x = 530,414,179.74
  5. Step 5: Solve for x
    x = 530,414,179.74/26,989.80
  6. Step 6: Final answer
    x = 19,652.39

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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.