Home / 20,990.54-28,953.75-12,486.61

Finding the Fourth Proportional to 20,990.54, 28,953.75 and 12,486.61

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Solution

The fourth proportional to 20,990.54, 28,953.75 and 12,486.61 is: 17,223.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.54 : 28,953.75 = 12,486.61 : x
  2. Step 2: Convert to fraction form
    20,990.54/28,953.75 = 12,486.61/x
  3. Step 3: Cross multiply
    20,990.54x = 28,953.75 × 12,486.61
  4. Step 4: Simplify right side
    20,990.54x = 361,534,104.44
  5. Step 5: Solve for x
    x = 361,534,104.44/20,990.54
  6. Step 6: Final answer
    x = 17,223.67

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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.