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Finding the Fourth Proportional to 16,421.81, 22,662.14 and 8,969.81

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Solution

The fourth proportional to 16,421.81, 22,662.14 and 8,969.81 is: 12,378.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,421.81 : 22,662.14 = 8,969.81 : x
  2. Step 2: Convert to fraction form
    16,421.81/22,662.14 = 8,969.81/x
  3. Step 3: Cross multiply
    16,421.81x = 22,662.14 × 8,969.81
  4. Step 4: Simplify right side
    16,421.81x = 203,275,101.80
  5. Step 5: Solve for x
    x = 203,275,101.80/16,421.81
  6. Step 6: Final answer
    x = 12,378.36

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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.