Home / 20,857.64-31,289.87-6,813.59

Finding the Fourth Proportional to 20,857.64, 31,289.87 and 6,813.59

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Solution

The fourth proportional to 20,857.64, 31,289.87 and 6,813.59 is: 10,221.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.64 : 31,289.87 = 6,813.59 : x
  2. Step 2: Convert to fraction form
    20,857.64/31,289.87 = 6,813.59/x
  3. Step 3: Cross multiply
    20,857.64x = 31,289.87 × 6,813.59
  4. Step 4: Simplify right side
    20,857.64x = 213,196,154.82
  5. Step 5: Solve for x
    x = 213,196,154.82/20,857.64
  6. Step 6: Final answer
    x = 10,221.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.