Home / 20,390.28-28,141.74-11,441.40

Finding the Fourth Proportional to 20,390.28, 28,141.74 and 11,441.40

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Solution

The fourth proportional to 20,390.28, 28,141.74 and 11,441.40 is: 15,790.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.28 : 28,141.74 = 11,441.40 : x
  2. Step 2: Convert to fraction form
    20,390.28/28,141.74 = 11,441.40/x
  3. Step 3: Cross multiply
    20,390.28x = 28,141.74 × 11,441.40
  4. Step 4: Simplify right side
    20,390.28x = 321,980,904.04
  5. Step 5: Solve for x
    x = 321,980,904.04/20,390.28
  6. Step 6: Final answer
    x = 15,790.90

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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.