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Finding the Fourth Proportional to 20,891.79, 28,809.68 and 12,513.15

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Solution

The fourth proportional to 20,891.79, 28,809.68 and 12,513.15 is: 17,255.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.79 : 28,809.68 = 12,513.15 : x
  2. Step 2: Convert to fraction form
    20,891.79/28,809.68 = 12,513.15/x
  3. Step 3: Cross multiply
    20,891.79x = 28,809.68 × 12,513.15
  4. Step 4: Simplify right side
    20,891.79x = 360,499,784.73
  5. Step 5: Solve for x
    x = 360,499,784.73/20,891.79
  6. Step 6: Final answer
    x = 17,255.57

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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.