Home / 20,917.85-31,364.48-8,427.65

Finding the Fourth Proportional to 20,917.85, 31,364.48 and 8,427.65

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Solution

The fourth proportional to 20,917.85, 31,364.48 and 8,427.65 is: 12,636.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.85 : 31,364.48 = 8,427.65 : x
  2. Step 2: Convert to fraction form
    20,917.85/31,364.48 = 8,427.65/x
  3. Step 3: Cross multiply
    20,917.85x = 31,364.48 × 8,427.65
  4. Step 4: Simplify right side
    20,917.85x = 264,328,724.12
  5. Step 5: Solve for x
    x = 264,328,724.12/20,917.85
  6. Step 6: Final answer
    x = 12,636.52

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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.