Home / 20,799.11-28,715.49-13,538.13

Finding the Fourth Proportional to 20,799.11, 28,715.49 and 13,538.13

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Solution

The fourth proportional to 20,799.11, 28,715.49 and 13,538.13 is: 18,690.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,799.11 : 28,715.49 = 13,538.13 : x
  2. Step 2: Convert to fraction form
    20,799.11/28,715.49 = 13,538.13/x
  3. Step 3: Cross multiply
    20,799.11x = 28,715.49 × 13,538.13
  4. Step 4: Simplify right side
    20,799.11x = 388,753,968.94
  5. Step 5: Solve for x
    x = 388,753,968.94/20,799.11
  6. Step 6: Final answer
    x = 18,690.90

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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.