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Finding the Fourth Proportional to 20,961, 28,919.12 and 14,234.96

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Solution

The fourth proportional to 20,961, 28,919.12 and 14,234.96 is: 19,639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961 : 28,919.12 = 14,234.96 : x
  2. Step 2: Convert to fraction form
    20,961/28,919.12 = 14,234.96/x
  3. Step 3: Cross multiply
    20,961x = 28,919.12 × 14,234.96
  4. Step 4: Simplify right side
    20,961x = 411,662,516.44
  5. Step 5: Solve for x
    x = 411,662,516.44/20,961
  6. Step 6: Final answer
    x = 19,639.45

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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.