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Finding the Fourth Proportional to 11,820.80, 17,730.20 and 3,612.80

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Solution

The fourth proportional to 11,820.80, 17,730.20 and 3,612.80 is: 5,418.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,820.80 : 17,730.20 = 3,612.80 : x
  2. Step 2: Convert to fraction form
    11,820.80/17,730.20 = 3,612.80/x
  3. Step 3: Cross multiply
    11,820.80x = 17,730.20 × 3,612.80
  4. Step 4: Simplify right side
    11,820.80x = 64,055,666.56
  5. Step 5: Solve for x
    x = 64,055,666.56/11,820.80
  6. Step 6: Final answer
    x = 5,418.89

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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.