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Finding the Fourth Proportional to 20,728.46, 28,605.26 and 11,297

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Solution

The fourth proportional to 20,728.46, 28,605.26 and 11,297 is: 15,589.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.46 : 28,605.26 = 11,297 : x
  2. Step 2: Convert to fraction form
    20,728.46/28,605.26 = 11,297/x
  3. Step 3: Cross multiply
    20,728.46x = 28,605.26 × 11,297
  4. Step 4: Simplify right side
    20,728.46x = 323,153,622.22
  5. Step 5: Solve for x
    x = 323,153,622.22/20,728.46
  6. Step 6: Final answer
    x = 15,589.85

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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.