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Finding the Fourth Proportional to 19,796.80, 27,329.60 and 15,310.40

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Solution

The fourth proportional to 19,796.80, 27,329.60 and 15,310.40 is: 21,136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,796.80 : 27,329.60 = 15,310.40 : x
  2. Step 2: Convert to fraction form
    19,796.80/27,329.60 = 15,310.40/x
  3. Step 3: Cross multiply
    19,796.80x = 27,329.60 × 15,310.40
  4. Step 4: Simplify right side
    19,796.80x = 418,427,107.84
  5. Step 5: Solve for x
    x = 418,427,107.84/19,796.80
  6. Step 6: Final answer
    x = 21,136.10

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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.