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Finding the Fourth Proportional to 14,136.80, 21,214.80 and 8,287.20

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Solution

The fourth proportional to 14,136.80, 21,214.80 and 8,287.20 is: 12,436.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,136.80 : 21,214.80 = 8,287.20 : x
  2. Step 2: Convert to fraction form
    14,136.80/21,214.80 = 8,287.20/x
  3. Step 3: Cross multiply
    14,136.80x = 21,214.80 × 8,287.20
  4. Step 4: Simplify right side
    14,136.80x = 175,811,290.56
  5. Step 5: Solve for x
    x = 175,811,290.56/14,136.80
  6. Step 6: Final answer
    x = 12,436.43

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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.