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Finding the Fourth Proportional to 18,999.72, 28,504.80 and 7,911.60

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Solution

The fourth proportional to 18,999.72, 28,504.80 and 7,911.60 is: 11,869.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.72 : 28,504.80 = 7,911.60 : x
  2. Step 2: Convert to fraction form
    18,999.72/28,504.80 = 7,911.60/x
  3. Step 3: Cross multiply
    18,999.72x = 28,504.80 × 7,911.60
  4. Step 4: Simplify right side
    18,999.72x = 225,518,575.68
  5. Step 5: Solve for x
    x = 225,518,575.68/18,999.72
  6. Step 6: Final answer
    x = 11,869.57

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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.