Home / 20,797.76-31,231.20-20,636.48

Finding the Fourth Proportional to 20,797.76, 31,231.20 and 20,636.48

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Solution

The fourth proportional to 20,797.76, 31,231.20 and 20,636.48 is: 30,989.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,797.76 : 31,231.20 = 20,636.48 : x
  2. Step 2: Convert to fraction form
    20,797.76/31,231.20 = 20,636.48/x
  3. Step 3: Cross multiply
    20,797.76x = 31,231.20 × 20,636.48
  4. Step 4: Simplify right side
    20,797.76x = 644,502,034.18
  5. Step 5: Solve for x
    x = 644,502,034.18/20,797.76
  6. Step 6: Final answer
    x = 30,989.01

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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.