Home / 20,811.96-28,719.65-11,858.70

Finding the Fourth Proportional to 20,811.96, 28,719.65 and 11,858.70

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Solution

The fourth proportional to 20,811.96, 28,719.65 and 11,858.70 is: 16,364.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.96 : 28,719.65 = 11,858.70 : x
  2. Step 2: Convert to fraction form
    20,811.96/28,719.65 = 11,858.70/x
  3. Step 3: Cross multiply
    20,811.96x = 28,719.65 × 11,858.70
  4. Step 4: Simplify right side
    20,811.96x = 340,577,713.46
  5. Step 5: Solve for x
    x = 340,577,713.46/20,811.96
  6. Step 6: Final answer
    x = 16,364.52

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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.