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Finding the Fourth Proportional to 18,751.17, 25,865.15 and 12,785.61

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Solution

The fourth proportional to 18,751.17, 25,865.15 and 12,785.61 is: 17,636.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.17 : 25,865.15 = 12,785.61 : x
  2. Step 2: Convert to fraction form
    18,751.17/25,865.15 = 12,785.61/x
  3. Step 3: Cross multiply
    18,751.17x = 25,865.15 × 12,785.61
  4. Step 4: Simplify right side
    18,751.17x = 330,701,656.56
  5. Step 5: Solve for x
    x = 330,701,656.56/18,751.17
  6. Step 6: Final answer
    x = 17,636.32

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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.