Home / 20,385.66-28,120.27-12,819.99

Finding the Fourth Proportional to 20,385.66, 28,120.27 and 12,819.99

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Solution

The fourth proportional to 20,385.66, 28,120.27 and 12,819.99 is: 17,684.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.66 : 28,120.27 = 12,819.99 : x
  2. Step 2: Convert to fraction form
    20,385.66/28,120.27 = 12,819.99/x
  3. Step 3: Cross multiply
    20,385.66x = 28,120.27 × 12,819.99
  4. Step 4: Simplify right side
    20,385.66x = 360,501,677.64
  5. Step 5: Solve for x
    x = 360,501,677.64/20,385.66
  6. Step 6: Final answer
    x = 17,684.08

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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.