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Finding the Fourth Proportional to 18,581.13, 27,858.74 and 6,891.21

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Solution

The fourth proportional to 18,581.13, 27,858.74 and 6,891.21 is: 10,332.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,581.13 : 27,858.74 = 6,891.21 : x
  2. Step 2: Convert to fraction form
    18,581.13/27,858.74 = 6,891.21/x
  3. Step 3: Cross multiply
    18,581.13x = 27,858.74 × 6,891.21
  4. Step 4: Simplify right side
    18,581.13x = 191,980,393.22
  5. Step 5: Solve for x
    x = 191,980,393.22/18,581.13
  6. Step 6: Final answer
    x = 10,332.01

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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.