Home / 20,605.32-28,435.20-11,173.88

Finding the Fourth Proportional to 20,605.32, 28,435.20 and 11,173.88

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Solution

The fourth proportional to 20,605.32, 28,435.20 and 11,173.88 is: 15,419.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,605.32 : 28,435.20 = 11,173.88 : x
  2. Step 2: Convert to fraction form
    20,605.32/28,435.20 = 11,173.88/x
  3. Step 3: Cross multiply
    20,605.32x = 28,435.20 × 11,173.88
  4. Step 4: Simplify right side
    20,605.32x = 317,731,370.40
  5. Step 5: Solve for x
    x = 317,731,370.40/20,605.32
  6. Step 6: Final answer
    x = 15,419.87

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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.