Home / 20,986.49-28,960.79-11,426.57

Finding the Fourth Proportional to 20,986.49, 28,960.79 and 11,426.57

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Solution

The fourth proportional to 20,986.49, 28,960.79 and 11,426.57 is: 15,768.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.49 : 28,960.79 = 11,426.57 : x
  2. Step 2: Convert to fraction form
    20,986.49/28,960.79 = 11,426.57/x
  3. Step 3: Cross multiply
    20,986.49x = 28,960.79 × 11,426.57
  4. Step 4: Simplify right side
    20,986.49x = 330,922,465.13
  5. Step 5: Solve for x
    x = 330,922,465.13/20,986.49
  6. Step 6: Final answer
    x = 15,768.36

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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.