Home / 20,790.30-28,689.72-11,358.90

Finding the Fourth Proportional to 20,790.30, 28,689.72 and 11,358.90

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Solution

The fourth proportional to 20,790.30, 28,689.72 and 11,358.90 is: 15,674.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.30 : 28,689.72 = 11,358.90 : x
  2. Step 2: Convert to fraction form
    20,790.30/28,689.72 = 11,358.90/x
  3. Step 3: Cross multiply
    20,790.30x = 28,689.72 × 11,358.90
  4. Step 4: Simplify right side
    20,790.30x = 325,883,660.51
  5. Step 5: Solve for x
    x = 325,883,660.51/20,790.30
  6. Step 6: Final answer
    x = 15,674.79

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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.