Home / 20,651.13-28,489.26-12,690.45

Finding the Fourth Proportional to 20,651.13, 28,489.26 and 12,690.45

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Solution

The fourth proportional to 20,651.13, 28,489.26 and 12,690.45 is: 17,507.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,651.13 : 28,489.26 = 12,690.45 : x
  2. Step 2: Convert to fraction form
    20,651.13/28,489.26 = 12,690.45/x
  3. Step 3: Cross multiply
    20,651.13x = 28,489.26 × 12,690.45
  4. Step 4: Simplify right side
    20,651.13x = 361,541,529.57
  5. Step 5: Solve for x
    x = 361,541,529.57/20,651.13
  6. Step 6: Final answer
    x = 17,507.11

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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.