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Finding the Fourth Proportional to 20,300.08, 28,019.64 and 11,919.28

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Solution

The fourth proportional to 20,300.08, 28,019.64 and 11,919.28 is: 16,451.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,300.08 : 28,019.64 = 11,919.28 : x
  2. Step 2: Convert to fraction form
    20,300.08/28,019.64 = 11,919.28/x
  3. Step 3: Cross multiply
    20,300.08x = 28,019.64 × 11,919.28
  4. Step 4: Simplify right side
    20,300.08x = 333,973,934.66
  5. Step 5: Solve for x
    x = 333,973,934.66/20,300.08
  6. Step 6: Final answer
    x = 16,451.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.