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Finding the Fourth Proportional to 12,188.61, 18,285.65 and 3,869.13

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Solution

The fourth proportional to 12,188.61, 18,285.65 and 3,869.13 is: 5,804.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,188.61 : 18,285.65 = 3,869.13 : x
  2. Step 2: Convert to fraction form
    12,188.61/18,285.65 = 3,869.13/x
  3. Step 3: Cross multiply
    12,188.61x = 18,285.65 × 3,869.13
  4. Step 4: Simplify right side
    12,188.61x = 70,749,620.72
  5. Step 5: Solve for x
    x = 70,749,620.72/12,188.61
  6. Step 6: Final answer
    x = 5,804.57

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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.