Home / 20,479.59-28,261.32-13,405.86

Finding the Fourth Proportional to 20,479.59, 28,261.32 and 13,405.86

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Solution

The fourth proportional to 20,479.59, 28,261.32 and 13,405.86 is: 18,499.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.59 : 28,261.32 = 13,405.86 : x
  2. Step 2: Convert to fraction form
    20,479.59/28,261.32 = 13,405.86/x
  3. Step 3: Cross multiply
    20,479.59x = 28,261.32 × 13,405.86
  4. Step 4: Simplify right side
    20,479.59x = 378,867,299.34
  5. Step 5: Solve for x
    x = 378,867,299.34/20,479.59
  6. Step 6: Final answer
    x = 18,499.75

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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.