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Finding the Fourth Proportional to 18,643.90, 27,919.13 and 11,142.85

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Solution

The fourth proportional to 18,643.90, 27,919.13 and 11,142.85 is: 16,686.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.90 : 27,919.13 = 11,142.85 : x
  2. Step 2: Convert to fraction form
    18,643.90/27,919.13 = 11,142.85/x
  3. Step 3: Cross multiply
    18,643.90x = 27,919.13 × 11,142.85
  4. Step 4: Simplify right side
    18,643.90x = 311,098,622.01
  5. Step 5: Solve for x
    x = 311,098,622.01/18,643.90
  6. Step 6: Final answer
    x = 16,686.35

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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.