Home / 20,965.21-28,932.53-11,405.69

Finding the Fourth Proportional to 20,965.21, 28,932.53 and 11,405.69

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Solution

The fourth proportional to 20,965.21, 28,932.53 and 11,405.69 is: 15,740.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.21 : 28,932.53 = 11,405.69 : x
  2. Step 2: Convert to fraction form
    20,965.21/28,932.53 = 11,405.69/x
  3. Step 3: Cross multiply
    20,965.21x = 28,932.53 × 11,405.69
  4. Step 4: Simplify right side
    20,965.21x = 329,995,568.94
  5. Step 5: Solve for x
    x = 329,995,568.94/20,965.21
  6. Step 6: Final answer
    x = 15,740.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.