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Finding the Fourth Proportional to 18,698.41, 28,059.79 and 9,939.48

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Solution

The fourth proportional to 18,698.41, 28,059.79 and 9,939.48 is: 14,915.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.41 : 28,059.79 = 9,939.48 : x
  2. Step 2: Convert to fraction form
    18,698.41/28,059.79 = 9,939.48/x
  3. Step 3: Cross multiply
    18,698.41x = 28,059.79 × 9,939.48
  4. Step 4: Simplify right side
    18,698.41x = 278,899,721.51
  5. Step 5: Solve for x
    x = 278,899,721.51/18,698.41
  6. Step 6: Final answer
    x = 14,915.69

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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.