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Finding the Fourth Proportional to 20,801.49, 28,719.81 and 12,855.39

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Solution

The fourth proportional to 20,801.49, 28,719.81 and 12,855.39 is: 17,748.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.49 : 28,719.81 = 12,855.39 : x
  2. Step 2: Convert to fraction form
    20,801.49/28,719.81 = 12,855.39/x
  3. Step 3: Cross multiply
    20,801.49x = 28,719.81 × 12,855.39
  4. Step 4: Simplify right side
    20,801.49x = 369,204,358.28
  5. Step 5: Solve for x
    x = 369,204,358.28/20,801.49
  6. Step 6: Final answer
    x = 17,748.94

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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.