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Finding the Fourth Proportional to 18,983.80, 28,499.10 and 11,963.80

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Solution

The fourth proportional to 18,983.80, 28,499.10 and 11,963.80 is: 17,960.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,983.80 : 28,499.10 = 11,963.80 : x
  2. Step 2: Convert to fraction form
    18,983.80/28,499.10 = 11,963.80/x
  3. Step 3: Cross multiply
    18,983.80x = 28,499.10 × 11,963.80
  4. Step 4: Simplify right side
    18,983.80x = 340,957,532.58
  5. Step 5: Solve for x
    x = 340,957,532.58/18,983.80
  6. Step 6: Final answer
    x = 17,960.45

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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.