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Finding the Fourth Proportional to 18,666.51, 28,003.87 and 13,721.16

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Solution

The fourth proportional to 18,666.51, 28,003.87 and 13,721.16 is: 20,584.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.51 : 28,003.87 = 13,721.16 : x
  2. Step 2: Convert to fraction form
    18,666.51/28,003.87 = 13,721.16/x
  3. Step 3: Cross multiply
    18,666.51x = 28,003.87 × 13,721.16
  4. Step 4: Simplify right side
    18,666.51x = 384,245,619.57
  5. Step 5: Solve for x
    x = 384,245,619.57/18,666.51
  6. Step 6: Final answer
    x = 20,584.75

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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.