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Finding the Fourth Proportional to 18,762.96, 28,136.12 and 5,612.80

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Solution

The fourth proportional to 18,762.96, 28,136.12 and 5,612.80 is: 8,416.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,762.96 : 28,136.12 = 5,612.80 : x
  2. Step 2: Convert to fraction form
    18,762.96/28,136.12 = 5,612.80/x
  3. Step 3: Cross multiply
    18,762.96x = 28,136.12 × 5,612.80
  4. Step 4: Simplify right side
    18,762.96x = 157,922,414.34
  5. Step 5: Solve for x
    x = 157,922,414.34/18,762.96
  6. Step 6: Final answer
    x = 8,416.71

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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.