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Finding the Fourth Proportional to 18,371.20, 27,499.20 and 13,187.20

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Solution

The fourth proportional to 18,371.20, 27,499.20 and 13,187.20 is: 19,739.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,371.20 : 27,499.20 = 13,187.20 : x
  2. Step 2: Convert to fraction form
    18,371.20/27,499.20 = 13,187.20/x
  3. Step 3: Cross multiply
    18,371.20x = 27,499.20 × 13,187.20
  4. Step 4: Simplify right side
    18,371.20x = 362,637,450.24
  5. Step 5: Solve for x
    x = 362,637,450.24/18,371.20
  6. Step 6: Final answer
    x = 19,739.45

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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.