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Finding the Fourth Proportional to 20,416.80, 30,613.84 and 7,929.04

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Solution

The fourth proportional to 20,416.80, 30,613.84 and 7,929.04 is: 11,889.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,416.80 : 30,613.84 = 7,929.04 : x
  2. Step 2: Convert to fraction form
    20,416.80/30,613.84 = 7,929.04/x
  3. Step 3: Cross multiply
    20,416.80x = 30,613.84 × 7,929.04
  4. Step 4: Simplify right side
    20,416.80x = 242,738,361.91
  5. Step 5: Solve for x
    x = 242,738,361.91/20,416.80
  6. Step 6: Final answer
    x = 11,889.15

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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.