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Finding the Fourth Proportional to 18,698.72, 28,039.90 and 7,003.74

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Solution

The fourth proportional to 18,698.72, 28,039.90 and 7,003.74 is: 10,502.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.72 : 28,039.90 = 7,003.74 : x
  2. Step 2: Convert to fraction form
    18,698.72/28,039.90 = 7,003.74/x
  3. Step 3: Cross multiply
    18,698.72x = 28,039.90 × 7,003.74
  4. Step 4: Simplify right side
    18,698.72x = 196,384,169.23
  5. Step 5: Solve for x
    x = 196,384,169.23/18,698.72
  6. Step 6: Final answer
    x = 10,502.55

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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.