Home / 20,815.11-31,220.06-12,271.46

Finding the Fourth Proportional to 20,815.11, 31,220.06 and 12,271.46

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Solution

The fourth proportional to 20,815.11, 31,220.06 and 12,271.46 is: 18,405.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.11 : 31,220.06 = 12,271.46 : x
  2. Step 2: Convert to fraction form
    20,815.11/31,220.06 = 12,271.46/x
  3. Step 3: Cross multiply
    20,815.11x = 31,220.06 × 12,271.46
  4. Step 4: Simplify right side
    20,815.11x = 383,115,500.03
  5. Step 5: Solve for x
    x = 383,115,500.03/20,815.11
  6. Step 6: Final answer
    x = 18,405.64

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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.