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Finding the Fourth Proportional to 13,136.99, 18,129.04 and 8,421.27

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Solution

The fourth proportional to 13,136.99, 18,129.04 and 8,421.27 is: 11,621.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.99 : 18,129.04 = 8,421.27 : x
  2. Step 2: Convert to fraction form
    13,136.99/18,129.04 = 8,421.27/x
  3. Step 3: Cross multiply
    13,136.99x = 18,129.04 × 8,421.27
  4. Step 4: Simplify right side
    13,136.99x = 152,669,451.64
  5. Step 5: Solve for x
    x = 152,669,451.64/13,136.99
  6. Step 6: Final answer
    x = 11,621.35

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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.