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Finding the Fourth Proportional to 18,805.60, 28,199.28 and 5,655.52

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Solution

The fourth proportional to 18,805.60, 28,199.28 and 5,655.52 is: 8,480.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.60 : 28,199.28 = 5,655.52 : x
  2. Step 2: Convert to fraction form
    18,805.60/28,199.28 = 5,655.52/x
  3. Step 3: Cross multiply
    18,805.60x = 28,199.28 × 5,655.52
  4. Step 4: Simplify right side
    18,805.60x = 159,481,592.03
  5. Step 5: Solve for x
    x = 159,481,592.03/18,805.60
  6. Step 6: Final answer
    x = 8,480.54

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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.