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Finding the Fourth Proportional to 20,136.60, 30,204.90 and 13,138.20

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Solution

The fourth proportional to 20,136.60, 30,204.90 and 13,138.20 is: 19,707.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,136.60 : 30,204.90 = 13,138.20 : x
  2. Step 2: Convert to fraction form
    20,136.60/30,204.90 = 13,138.20/x
  3. Step 3: Cross multiply
    20,136.60x = 30,204.90 × 13,138.20
  4. Step 4: Simplify right side
    20,136.60x = 396,838,017.18
  5. Step 5: Solve for x
    x = 396,838,017.18/20,136.60
  6. Step 6: Final answer
    x = 19,707.30

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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.