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Finding the Fourth Proportional to 20,626.50, 28,471.95 and 12,243

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Solution

The fourth proportional to 20,626.50, 28,471.95 and 12,243 is: 16,899.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,626.50 : 28,471.95 = 12,243 : x
  2. Step 2: Convert to fraction form
    20,626.50/28,471.95 = 12,243/x
  3. Step 3: Cross multiply
    20,626.50x = 28,471.95 × 12,243
  4. Step 4: Simplify right side
    20,626.50x = 348,582,083.85
  5. Step 5: Solve for x
    x = 348,582,083.85/20,626.50
  6. Step 6: Final answer
    x = 16,899.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.