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Finding the Fourth Proportional to 20,480.91, 30,672.15 and 11,689.17

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Solution

The fourth proportional to 20,480.91, 30,672.15 and 11,689.17 is: 17,505.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.91 : 30,672.15 = 11,689.17 : x
  2. Step 2: Convert to fraction form
    20,480.91/30,672.15 = 11,689.17/x
  3. Step 3: Cross multiply
    20,480.91x = 30,672.15 × 11,689.17
  4. Step 4: Simplify right side
    20,480.91x = 358,531,975.62
  5. Step 5: Solve for x
    x = 358,531,975.62/20,480.91
  6. Step 6: Final answer
    x = 17,505.67

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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.