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Finding the Fourth Proportional to 26,458.56, 39,687.72 and 7,990.56

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Solution

The fourth proportional to 26,458.56, 39,687.72 and 7,990.56 is: 11,985.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,458.56 : 39,687.72 = 7,990.56 : x
  2. Step 2: Convert to fraction form
    26,458.56/39,687.72 = 7,990.56/x
  3. Step 3: Cross multiply
    26,458.56x = 39,687.72 × 7,990.56
  4. Step 4: Simplify right side
    26,458.56x = 317,127,107.92
  5. Step 5: Solve for x
    x = 317,127,107.92/26,458.56
  6. Step 6: Final answer
    x = 11,985.80

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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.