Home / 21,189.28-31,777.86-8,539

Finding the Fourth Proportional to 21,189.28, 31,777.86 and 8,539

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Solution

The fourth proportional to 21,189.28, 31,777.86 and 8,539 is: 12,806.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.28 : 31,777.86 = 8,539 : x
  2. Step 2: Convert to fraction form
    21,189.28/31,777.86 = 8,539/x
  3. Step 3: Cross multiply
    21,189.28x = 31,777.86 × 8,539
  4. Step 4: Simplify right side
    21,189.28x = 271,351,146.54
  5. Step 5: Solve for x
    x = 271,351,146.54/21,189.28
  6. Step 6: Final answer
    x = 12,806.06

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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.