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Finding the Fourth Proportional to 18,686.74, 28,061.85 and 12,486.59

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Solution

The fourth proportional to 18,686.74, 28,061.85 and 12,486.59 is: 18,751.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.74 : 28,061.85 = 12,486.59 : x
  2. Step 2: Convert to fraction form
    18,686.74/28,061.85 = 12,486.59/x
  3. Step 3: Cross multiply
    18,686.74x = 28,061.85 × 12,486.59
  4. Step 4: Simplify right side
    18,686.74x = 350,396,815.59
  5. Step 5: Solve for x
    x = 350,396,815.59/18,686.74
  6. Step 6: Final answer
    x = 18,751.09

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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.