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Finding the Fourth Proportional to 26,990.60, 40,421.10 and 21,806.60

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Solution

The fourth proportional to 26,990.60, 40,421.10 and 21,806.60 is: 32,657.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,990.60 : 40,421.10 = 21,806.60 : x
  2. Step 2: Convert to fraction form
    26,990.60/40,421.10 = 21,806.60/x
  3. Step 3: Cross multiply
    26,990.60x = 40,421.10 × 21,806.60
  4. Step 4: Simplify right side
    26,990.60x = 881,446,759.26
  5. Step 5: Solve for x
    x = 881,446,759.26/26,990.60
  6. Step 6: Final answer
    x = 32,657.55

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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.