Home / 20,382.55-28,116-12,816.90

Finding the Fourth Proportional to 20,382.55, 28,116 and 12,816.90

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Solution

The fourth proportional to 20,382.55, 28,116 and 12,816.90 is: 17,679.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.55 : 28,116 = 12,816.90 : x
  2. Step 2: Convert to fraction form
    20,382.55/28,116 = 12,816.90/x
  3. Step 3: Cross multiply
    20,382.55x = 28,116 × 12,816.90
  4. Step 4: Simplify right side
    20,382.55x = 360,359,960.40
  5. Step 5: Solve for x
    x = 360,359,960.40/20,382.55
  6. Step 6: Final answer
    x = 17,679.83

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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.