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Finding the Fourth Proportional to 18,539.60, 27,806.70 and 5,390.60

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Solution

The fourth proportional to 18,539.60, 27,806.70 and 5,390.60 is: 8,085.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,539.60 : 27,806.70 = 5,390.60 : x
  2. Step 2: Convert to fraction form
    18,539.60/27,806.70 = 5,390.60/x
  3. Step 3: Cross multiply
    18,539.60x = 27,806.70 × 5,390.60
  4. Step 4: Simplify right side
    18,539.60x = 149,894,797.02
  5. Step 5: Solve for x
    x = 149,894,797.02/18,539.60
  6. Step 6: Final answer
    x = 8,085.11

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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.