Home / 20,456.64-28,231.20-12,072.96

Finding the Fourth Proportional to 20,456.64, 28,231.20 and 12,072.96

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Solution

The fourth proportional to 20,456.64, 28,231.20 and 12,072.96 is: 16,661.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.64 : 28,231.20 = 12,072.96 : x
  2. Step 2: Convert to fraction form
    20,456.64/28,231.20 = 12,072.96/x
  3. Step 3: Cross multiply
    20,456.64x = 28,231.20 × 12,072.96
  4. Step 4: Simplify right side
    20,456.64x = 340,834,148.35
  5. Step 5: Solve for x
    x = 340,834,148.35/20,456.64
  6. Step 6: Final answer
    x = 16,661.30

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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.