Home / 20,986.80-31,480.20-20,768.10

Finding the Fourth Proportional to 20,986.80, 31,480.20 and 20,768.10

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Solution

The fourth proportional to 20,986.80, 31,480.20 and 20,768.10 is: 31,152.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.80 : 31,480.20 = 20,768.10 : x
  2. Step 2: Convert to fraction form
    20,986.80/31,480.20 = 20,768.10/x
  3. Step 3: Cross multiply
    20,986.80x = 31,480.20 × 20,768.10
  4. Step 4: Simplify right side
    20,986.80x = 653,783,941.62
  5. Step 5: Solve for x
    x = 653,783,941.62/20,986.80
  6. Step 6: Final answer
    x = 31,152.15

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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.