Home / 20,810.86-28,719.08-11,379.41

Finding the Fourth Proportional to 20,810.86, 28,719.08 and 11,379.41

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Solution

The fourth proportional to 20,810.86, 28,719.08 and 11,379.41 is: 15,703.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.86 : 28,719.08 = 11,379.41 : x
  2. Step 2: Convert to fraction form
    20,810.86/28,719.08 = 11,379.41/x
  3. Step 3: Cross multiply
    20,810.86x = 28,719.08 × 11,379.41
  4. Step 4: Simplify right side
    20,810.86x = 326,806,129.25
  5. Step 5: Solve for x
    x = 326,806,129.25/20,810.86
  6. Step 6: Final answer
    x = 15,703.64

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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.