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Finding the Fourth Proportional to 20,863.92, 28,792.59 and 11,431.92

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Solution

The fourth proportional to 20,863.92, 28,792.59 and 11,431.92 is: 15,776.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.92 : 28,792.59 = 11,431.92 : x
  2. Step 2: Convert to fraction form
    20,863.92/28,792.59 = 11,431.92/x
  3. Step 3: Cross multiply
    20,863.92x = 28,792.59 × 11,431.92
  4. Step 4: Simplify right side
    20,863.92x = 329,154,585.47
  5. Step 5: Solve for x
    x = 329,154,585.47/20,863.92
  6. Step 6: Final answer
    x = 15,776.26

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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.