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Finding the Fourth Proportional to 26,600.40, 39,900.60 and 19,990.80

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Solution

The fourth proportional to 26,600.40, 39,900.60 and 19,990.80 is: 29,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,600.40 : 39,900.60 = 19,990.80 : x
  2. Step 2: Convert to fraction form
    26,600.40/39,900.60 = 19,990.80/x
  3. Step 3: Cross multiply
    26,600.40x = 39,900.60 × 19,990.80
  4. Step 4: Simplify right side
    26,600.40x = 797,644,914.48
  5. Step 5: Solve for x
    x = 797,644,914.48/26,600.40
  6. Step 6: Final answer
    x = 29,986.20

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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.