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Finding the Fourth Proportional to 21,806.60, 32,709.90 and 5,390.60

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Solution

The fourth proportional to 21,806.60, 32,709.90 and 5,390.60 is: 8,085.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,806.60 : 32,709.90 = 5,390.60 : x
  2. Step 2: Convert to fraction form
    21,806.60/32,709.90 = 5,390.60/x
  3. Step 3: Cross multiply
    21,806.60x = 32,709.90 × 5,390.60
  4. Step 4: Simplify right side
    21,806.60x = 176,325,986.94
  5. Step 5: Solve for x
    x = 176,325,986.94/21,806.60
  6. Step 6: Final answer
    x = 8,085.90

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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.