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Finding the Fourth Proportional to 12,339.40, 18,528.90 and 11,429.80

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Solution

The fourth proportional to 12,339.40, 18,528.90 and 11,429.80 is: 17,163.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.40 : 18,528.90 = 11,429.80 : x
  2. Step 2: Convert to fraction form
    12,339.40/18,528.90 = 11,429.80/x
  3. Step 3: Cross multiply
    12,339.40x = 18,528.90 × 11,429.80
  4. Step 4: Simplify right side
    12,339.40x = 211,781,621.22
  5. Step 5: Solve for x
    x = 211,781,621.22/12,339.40
  6. Step 6: Final answer
    x = 17,163.04

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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.