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Finding the Fourth Proportional to 67,136.28, 100,706.64 and 20,389

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Solution

The fourth proportional to 67,136.28, 100,706.64 and 20,389 is: 30,584.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,136.28 : 100,706.64 = 20,389 : x
  2. Step 2: Convert to fraction form
    67,136.28/100,706.64 = 20,389/x
  3. Step 3: Cross multiply
    67,136.28x = 100,706.64 × 20,389
  4. Step 4: Simplify right side
    67,136.28x = 2,053,307,682.96
  5. Step 5: Solve for x
    x = 2,053,307,682.96/67,136.28
  6. Step 6: Final answer
    x = 30,584.17

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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.