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Finding the Fourth Proportional to 11,390.87, 17,075.87 and 3,991.28

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Solution

The fourth proportional to 11,390.87, 17,075.87 and 3,991.28 is: 5,983.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,390.87 : 17,075.87 = 3,991.28 : x
  2. Step 2: Convert to fraction form
    11,390.87/17,075.87 = 3,991.28/x
  3. Step 3: Cross multiply
    11,390.87x = 17,075.87 × 3,991.28
  4. Step 4: Simplify right side
    11,390.87x = 68,154,558.46
  5. Step 5: Solve for x
    x = 68,154,558.46/11,390.87
  6. Step 6: Final answer
    x = 5,983.26

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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.