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Finding the Fourth Proportional to 26,406, 39,626.28 and 9,990

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Solution

The fourth proportional to 26,406, 39,626.28 and 9,990 is: 14,991.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,406 : 39,626.28 = 9,990 : x
  2. Step 2: Convert to fraction form
    26,406/39,626.28 = 9,990/x
  3. Step 3: Cross multiply
    26,406x = 39,626.28 × 9,990
  4. Step 4: Simplify right side
    26,406x = 395,866,537.20
  5. Step 5: Solve for x
    x = 395,866,537.20/26,406
  6. Step 6: Final answer
    x = 14,991.54

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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.