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Finding the Fourth Proportional to 20,493.39, 28,283 and 12,540.90

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Solution

The fourth proportional to 20,493.39, 28,283 and 12,540.90 is: 17,307.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,493.39 : 28,283 = 12,540.90 : x
  2. Step 2: Convert to fraction form
    20,493.39/28,283 = 12,540.90/x
  3. Step 3: Cross multiply
    20,493.39x = 28,283 × 12,540.90
  4. Step 4: Simplify right side
    20,493.39x = 354,694,274.70
  5. Step 5: Solve for x
    x = 354,694,274.70/20,493.39
  6. Step 6: Final answer
    x = 17,307.74

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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.