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Finding the Fourth Proportional to 18,698.74, 28,042 and 6,215.40

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Solution

The fourth proportional to 18,698.74, 28,042 and 6,215.40 is: 9,321.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.74 : 28,042 = 6,215.40 : x
  2. Step 2: Convert to fraction form
    18,698.74/28,042 = 6,215.40/x
  3. Step 3: Cross multiply
    18,698.74x = 28,042 × 6,215.40
  4. Step 4: Simplify right side
    18,698.74x = 174,292,246.80
  5. Step 5: Solve for x
    x = 174,292,246.80/18,698.74
  6. Step 6: Final answer
    x = 9,321.07

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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.