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Finding the Fourth Proportional to 21,136.80, 29,168.01 and 12,184.68

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Solution

The fourth proportional to 21,136.80, 29,168.01 and 12,184.68 is: 16,814.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.80 : 29,168.01 = 12,184.68 : x
  2. Step 2: Convert to fraction form
    21,136.80/29,168.01 = 12,184.68/x
  3. Step 3: Cross multiply
    21,136.80x = 29,168.01 × 12,184.68
  4. Step 4: Simplify right side
    21,136.80x = 355,402,868.09
  5. Step 5: Solve for x
    x = 355,402,868.09/21,136.80
  6. Step 6: Final answer
    x = 16,814.41

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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.