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Finding the Fourth Proportional to 20,145.90, 30,182.40 and 17,229.90

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Solution

The fourth proportional to 20,145.90, 30,182.40 and 17,229.90 is: 25,813.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,145.90 : 30,182.40 = 17,229.90 : x
  2. Step 2: Convert to fraction form
    20,145.90/30,182.40 = 17,229.90/x
  3. Step 3: Cross multiply
    20,145.90x = 30,182.40 × 17,229.90
  4. Step 4: Simplify right side
    20,145.90x = 520,039,733.76
  5. Step 5: Solve for x
    x = 520,039,733.76/20,145.90
  6. Step 6: Final answer
    x = 25,813.68

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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.