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Finding the Fourth Proportional to 28,514.80, 42,820.80 and 18,697.60

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Solution

The fourth proportional to 28,514.80, 42,820.80 and 18,697.60 is: 28,078.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,514.80 : 42,820.80 = 18,697.60 : x
  2. Step 2: Convert to fraction form
    28,514.80/42,820.80 = 18,697.60/x
  3. Step 3: Cross multiply
    28,514.80x = 42,820.80 × 18,697.60
  4. Step 4: Simplify right side
    28,514.80x = 800,646,190.08
  5. Step 5: Solve for x
    x = 800,646,190.08/28,514.80
  6. Step 6: Final answer
    x = 28,078.27

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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.