Home / 20,856.08-31,284.32-8,207.12

Finding the Fourth Proportional to 20,856.08, 31,284.32 and 8,207.12

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Solution

The fourth proportional to 20,856.08, 31,284.32 and 8,207.12 is: 12,310.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.08 : 31,284.32 = 8,207.12 : x
  2. Step 2: Convert to fraction form
    20,856.08/31,284.32 = 8,207.12/x
  3. Step 3: Cross multiply
    20,856.08x = 31,284.32 × 8,207.12
  4. Step 4: Simplify right side
    20,856.08x = 256,753,970.90
  5. Step 5: Solve for x
    x = 256,753,970.90/20,856.08
  6. Step 6: Final answer
    x = 12,310.75

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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.