Home / 20,439.97-28,205.53-11,485.79

Finding the Fourth Proportional to 20,439.97, 28,205.53 and 11,485.79

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Solution

The fourth proportional to 20,439.97, 28,205.53 and 11,485.79 is: 15,849.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.97 : 28,205.53 = 11,485.79 : x
  2. Step 2: Convert to fraction form
    20,439.97/28,205.53 = 11,485.79/x
  3. Step 3: Cross multiply
    20,439.97x = 28,205.53 × 11,485.79
  4. Step 4: Simplify right side
    20,439.97x = 323,962,794.42
  5. Step 5: Solve for x
    x = 323,962,794.42/20,439.97
  6. Step 6: Final answer
    x = 15,849.48

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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.