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Finding the Fourth Proportional to 20,286.70, 30,430.05 and 11,538.70

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Solution

The fourth proportional to 20,286.70, 30,430.05 and 11,538.70 is: 17,308.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,286.70 : 30,430.05 = 11,538.70 : x
  2. Step 2: Convert to fraction form
    20,286.70/30,430.05 = 11,538.70/x
  3. Step 3: Cross multiply
    20,286.70x = 30,430.05 × 11,538.70
  4. Step 4: Simplify right side
    20,286.70x = 351,123,217.94
  5. Step 5: Solve for x
    x = 351,123,217.94/20,286.70
  6. Step 6: Final answer
    x = 17,308.05

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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.