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Finding the Fourth Proportional to 18,690.82, 28,005.01 and 13,134.22

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Solution

The fourth proportional to 18,690.82, 28,005.01 and 13,134.22 is: 19,679.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.82 : 28,005.01 = 13,134.22 : x
  2. Step 2: Convert to fraction form
    18,690.82/28,005.01 = 13,134.22/x
  3. Step 3: Cross multiply
    18,690.82x = 28,005.01 × 13,134.22
  4. Step 4: Simplify right side
    18,690.82x = 367,823,859.59
  5. Step 5: Solve for x
    x = 367,823,859.59/18,690.82
  6. Step 6: Final answer
    x = 19,679.39

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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.