Home / 20,715.25-28,590.75-12,216.85

Finding the Fourth Proportional to 20,715.25, 28,590.75 and 12,216.85

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Solution

The fourth proportional to 20,715.25, 28,590.75 and 12,216.85 is: 16,861.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.25 : 28,590.75 = 12,216.85 : x
  2. Step 2: Convert to fraction form
    20,715.25/28,590.75 = 12,216.85/x
  3. Step 3: Cross multiply
    20,715.25x = 28,590.75 × 12,216.85
  4. Step 4: Simplify right side
    20,715.25x = 349,288,904.14
  5. Step 5: Solve for x
    x = 349,288,904.14/20,715.25
  6. Step 6: Final answer
    x = 16,861.44

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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.