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Finding the Fourth Proportional to 20,919.20, 28,820.32 and 14,452.64

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Solution

The fourth proportional to 20,919.20, 28,820.32 and 14,452.64 is: 19,911.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.20 : 28,820.32 = 14,452.64 : x
  2. Step 2: Convert to fraction form
    20,919.20/28,820.32 = 14,452.64/x
  3. Step 3: Cross multiply
    20,919.20x = 28,820.32 × 14,452.64
  4. Step 4: Simplify right side
    20,919.20x = 416,529,698.34
  5. Step 5: Solve for x
    x = 416,529,698.34/20,919.20
  6. Step 6: Final answer
    x = 19,911.36

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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.