Home / 20,631.70-28,407-18,206.56

Finding the Fourth Proportional to 20,631.70, 28,407 and 18,206.56

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Solution

The fourth proportional to 20,631.70, 28,407 and 18,206.56 is: 25,067.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,631.70 : 28,407 = 18,206.56 : x
  2. Step 2: Convert to fraction form
    20,631.70/28,407 = 18,206.56/x
  3. Step 3: Cross multiply
    20,631.70x = 28,407 × 18,206.56
  4. Step 4: Simplify right side
    20,631.70x = 517,193,749.92
  5. Step 5: Solve for x
    x = 517,193,749.92/20,631.70
  6. Step 6: Final answer
    x = 25,067.92

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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.