Home / 20,975.68-28,943.08-13,428.72

Finding the Fourth Proportional to 20,975.68, 28,943.08 and 13,428.72

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Solution

The fourth proportional to 20,975.68, 28,943.08 and 13,428.72 is: 18,529.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.68 : 28,943.08 = 13,428.72 : x
  2. Step 2: Convert to fraction form
    20,975.68/28,943.08 = 13,428.72/x
  3. Step 3: Cross multiply
    20,975.68x = 28,943.08 × 13,428.72
  4. Step 4: Simplify right side
    20,975.68x = 388,668,517.26
  5. Step 5: Solve for x
    x = 388,668,517.26/20,975.68
  6. Step 6: Final answer
    x = 18,529.48

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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.