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Finding the Fourth Proportional to 18,136.80, 27,205.20 and 4,989.15

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Solution

The fourth proportional to 18,136.80, 27,205.20 and 4,989.15 is: 7,483.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,136.80 : 27,205.20 = 4,989.15 : x
  2. Step 2: Convert to fraction form
    18,136.80/27,205.20 = 4,989.15/x
  3. Step 3: Cross multiply
    18,136.80x = 27,205.20 × 4,989.15
  4. Step 4: Simplify right side
    18,136.80x = 135,730,823.58
  5. Step 5: Solve for x
    x = 135,730,823.58/18,136.80
  6. Step 6: Final answer
    x = 7,483.73

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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.