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Finding the Fourth Proportional to 20,827.60, 28,751.40 and 15,792.40

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Solution

The fourth proportional to 20,827.60, 28,751.40 and 15,792.40 is: 21,800.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,827.60 : 28,751.40 = 15,792.40 : x
  2. Step 2: Convert to fraction form
    20,827.60/28,751.40 = 15,792.40/x
  3. Step 3: Cross multiply
    20,827.60x = 28,751.40 × 15,792.40
  4. Step 4: Simplify right side
    20,827.60x = 454,053,609.36
  5. Step 5: Solve for x
    x = 454,053,609.36/20,827.60
  6. Step 6: Final answer
    x = 21,800.57

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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.