Home / 20,990.91-31,485.71-8,507.58

Finding the Fourth Proportional to 20,990.91, 31,485.71 and 8,507.58

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Solution

The fourth proportional to 20,990.91, 31,485.71 and 8,507.58 is: 12,761.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.91 : 31,485.71 = 8,507.58 : x
  2. Step 2: Convert to fraction form
    20,990.91/31,485.71 = 8,507.58/x
  3. Step 3: Cross multiply
    20,990.91x = 31,485.71 × 8,507.58
  4. Step 4: Simplify right side
    20,990.91x = 267,867,154.14
  5. Step 5: Solve for x
    x = 267,867,154.14/20,990.91
  6. Step 6: Final answer
    x = 12,761.10

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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.