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Finding the Fourth Proportional to 18,766.60, 28,129.64 and 12,197.52

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Solution

The fourth proportional to 18,766.60, 28,129.64 and 12,197.52 is: 18,283.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,766.60 : 28,129.64 = 12,197.52 : x
  2. Step 2: Convert to fraction form
    18,766.60/28,129.64 = 12,197.52/x
  3. Step 3: Cross multiply
    18,766.60x = 28,129.64 × 12,197.52
  4. Step 4: Simplify right side
    18,766.60x = 343,111,846.49
  5. Step 5: Solve for x
    x = 343,111,846.49/18,766.60
  6. Step 6: Final answer
    x = 18,283.11

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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.