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Finding the Fourth Proportional to 18,139.70, 27,187.95 and 7,609.70

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Solution

The fourth proportional to 18,139.70, 27,187.95 and 7,609.70 is: 11,405.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,139.70 : 27,187.95 = 7,609.70 : x
  2. Step 2: Convert to fraction form
    18,139.70/27,187.95 = 7,609.70/x
  3. Step 3: Cross multiply
    18,139.70x = 27,187.95 × 7,609.70
  4. Step 4: Simplify right side
    18,139.70x = 206,892,143.12
  5. Step 5: Solve for x
    x = 206,892,143.12/18,139.70
  6. Step 6: Final answer
    x = 11,405.49

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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.