Home / 20,390.28-28,145.60-12,849.32

Finding the Fourth Proportional to 20,390.28, 28,145.60 and 12,849.32

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Solution

The fourth proportional to 20,390.28, 28,145.60 and 12,849.32 is: 17,736.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.28 : 28,145.60 = 12,849.32 : x
  2. Step 2: Convert to fraction form
    20,390.28/28,145.60 = 12,849.32/x
  3. Step 3: Cross multiply
    20,390.28x = 28,145.60 × 12,849.32
  4. Step 4: Simplify right side
    20,390.28x = 361,651,616.02
  5. Step 5: Solve for x
    x = 361,651,616.02/20,390.28
  6. Step 6: Final answer
    x = 17,736.47

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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.