Home / 20,989.20-31,479.59-10,311.10

Finding the Fourth Proportional to 20,989.20, 31,479.59 and 10,311.10

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Solution

The fourth proportional to 20,989.20, 31,479.59 and 10,311.10 is: 15,464.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.20 : 31,479.59 = 10,311.10 : x
  2. Step 2: Convert to fraction form
    20,989.20/31,479.59 = 10,311.10/x
  3. Step 3: Cross multiply
    20,989.20x = 31,479.59 × 10,311.10
  4. Step 4: Simplify right side
    20,989.20x = 324,589,089.53
  5. Step 5: Solve for x
    x = 324,589,089.53/20,989.20
  6. Step 6: Final answer
    x = 15,464.58

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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.