Home / 20,811.40-28,716.51-11,859.28

Finding the Fourth Proportional to 20,811.40, 28,716.51 and 11,859.28

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Solution

The fourth proportional to 20,811.40, 28,716.51 and 11,859.28 is: 16,363.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.40 : 28,716.51 = 11,859.28 : x
  2. Step 2: Convert to fraction form
    20,811.40/28,716.51 = 11,859.28/x
  3. Step 3: Cross multiply
    20,811.40x = 28,716.51 × 11,859.28
  4. Step 4: Simplify right side
    20,811.40x = 340,557,132.71
  5. Step 5: Solve for x
    x = 340,557,132.71/20,811.40
  6. Step 6: Final answer
    x = 16,363.97

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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.