Home / 20,810.92-28,719-11,379.48

Finding the Fourth Proportional to 20,810.92, 28,719 and 11,379.48

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Solution

The fourth proportional to 20,810.92, 28,719 and 11,379.48 is: 15,703.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.92 : 28,719 = 11,379.48 : x
  2. Step 2: Convert to fraction form
    20,810.92/28,719 = 11,379.48/x
  3. Step 3: Cross multiply
    20,810.92x = 28,719 × 11,379.48
  4. Step 4: Simplify right side
    20,810.92x = 326,807,286.12
  5. Step 5: Solve for x
    x = 326,807,286.12/20,810.92
  6. Step 6: Final answer
    x = 15,703.64

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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.