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Finding the Fourth Proportional to 7,905.81, 11,857.37 and 2,640.22

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Solution

The fourth proportional to 7,905.81, 11,857.37 and 2,640.22 is: 3,959.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,905.81 : 11,857.37 = 2,640.22 : x
  2. Step 2: Convert to fraction form
    7,905.81/11,857.37 = 2,640.22/x
  3. Step 3: Cross multiply
    7,905.81x = 11,857.37 × 2,640.22
  4. Step 4: Simplify right side
    7,905.81x = 31,306,071.99
  5. Step 5: Solve for x
    x = 31,306,071.99/7,905.81
  6. Step 6: Final answer
    x = 3,959.88

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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.