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Finding the Fourth Proportional to 18,085.80, 27,128.70 and 12,180.90

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Solution

The fourth proportional to 18,085.80, 27,128.70 and 12,180.90 is: 18,271.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,085.80 : 27,128.70 = 12,180.90 : x
  2. Step 2: Convert to fraction form
    18,085.80/27,128.70 = 12,180.90/x
  3. Step 3: Cross multiply
    18,085.80x = 27,128.70 × 12,180.90
  4. Step 4: Simplify right side
    18,085.80x = 330,451,981.83
  5. Step 5: Solve for x
    x = 330,451,981.83/18,085.80
  6. Step 6: Final answer
    x = 18,271.35

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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.