Home / 21,181.24-31,786.85-8,712.64

Finding the Fourth Proportional to 21,181.24, 31,786.85 and 8,712.64

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Solution

The fourth proportional to 21,181.24, 31,786.85 and 8,712.64 is: 13,075.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181.24 : 31,786.85 = 8,712.64 : x
  2. Step 2: Convert to fraction form
    21,181.24/31,786.85 = 8,712.64/x
  3. Step 3: Cross multiply
    21,181.24x = 31,786.85 × 8,712.64
  4. Step 4: Simplify right side
    21,181.24x = 276,947,380.78
  5. Step 5: Solve for x
    x = 276,947,380.78/21,181.24
  6. Step 6: Final answer
    x = 13,075.13

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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.