Home / 20,805.76-31,199.04-8,315.26

Finding the Fourth Proportional to 20,805.76, 31,199.04 and 8,315.26

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Solution

The fourth proportional to 20,805.76, 31,199.04 and 8,315.26 is: 12,469.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.76 : 31,199.04 = 8,315.26 : x
  2. Step 2: Convert to fraction form
    20,805.76/31,199.04 = 8,315.26/x
  3. Step 3: Cross multiply
    20,805.76x = 31,199.04 × 8,315.26
  4. Step 4: Simplify right side
    20,805.76x = 259,428,051.35
  5. Step 5: Solve for x
    x = 259,428,051.35/20,805.76
  6. Step 6: Final answer
    x = 12,469.05

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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.