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Finding the Fourth Proportional to 12,612.80, 18,919.20 and 11,403.20

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Solution

The fourth proportional to 12,612.80, 18,919.20 and 11,403.20 is: 17,104.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,612.80 : 18,919.20 = 11,403.20 : x
  2. Step 2: Convert to fraction form
    12,612.80/18,919.20 = 11,403.20/x
  3. Step 3: Cross multiply
    12,612.80x = 18,919.20 × 11,403.20
  4. Step 4: Simplify right side
    12,612.80x = 215,739,421.44
  5. Step 5: Solve for x
    x = 215,739,421.44/12,612.80
  6. Step 6: Final answer
    x = 17,104.80

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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.