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Finding the Fourth Proportional to 18,519.76, 27,790.44 and 7,431.40

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Solution

The fourth proportional to 18,519.76, 27,790.44 and 7,431.40 is: 11,151.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,519.76 : 27,790.44 = 7,431.40 : x
  2. Step 2: Convert to fraction form
    18,519.76/27,790.44 = 7,431.40/x
  3. Step 3: Cross multiply
    18,519.76x = 27,790.44 × 7,431.40
  4. Step 4: Simplify right side
    18,519.76x = 206,521,875.82
  5. Step 5: Solve for x
    x = 206,521,875.82/18,519.76
  6. Step 6: Final answer
    x = 11,151.43

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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.