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Finding the Fourth Proportional to 12,339.30, 18,545.40 and 12,120.60

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Solution

The fourth proportional to 12,339.30, 18,545.40 and 12,120.60 is: 18,216.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.30 : 18,545.40 = 12,120.60 : x
  2. Step 2: Convert to fraction form
    12,339.30/18,545.40 = 12,120.60/x
  3. Step 3: Cross multiply
    12,339.30x = 18,545.40 × 12,120.60
  4. Step 4: Simplify right side
    12,339.30x = 224,781,375.24
  5. Step 5: Solve for x
    x = 224,781,375.24/12,339.30
  6. Step 6: Final answer
    x = 18,216.70

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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.