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Finding the Fourth Proportional to 20,273.99, 30,426.65 and 10,421.87

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Solution

The fourth proportional to 20,273.99, 30,426.65 and 10,421.87 is: 15,640.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,273.99 : 30,426.65 = 10,421.87 : x
  2. Step 2: Convert to fraction form
    20,273.99/30,426.65 = 10,421.87/x
  3. Step 3: Cross multiply
    20,273.99x = 30,426.65 × 10,421.87
  4. Step 4: Simplify right side
    20,273.99x = 317,102,538.73
  5. Step 5: Solve for x
    x = 317,102,538.73/20,273.99
  6. Step 6: Final answer
    x = 15,640.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.