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Finding the Fourth Proportional to 18,491.40, 27,740.70 and 7,961.40

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Solution

The fourth proportional to 18,491.40, 27,740.70 and 7,961.40 is: 11,943.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,491.40 : 27,740.70 = 7,961.40 : x
  2. Step 2: Convert to fraction form
    18,491.40/27,740.70 = 7,961.40/x
  3. Step 3: Cross multiply
    18,491.40x = 27,740.70 × 7,961.40
  4. Step 4: Simplify right side
    18,491.40x = 220,854,808.98
  5. Step 5: Solve for x
    x = 220,854,808.98/18,491.40
  6. Step 6: Final answer
    x = 11,943.65

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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.