Home / 20,986.80-31,516.65-11,145.30

Finding the Fourth Proportional to 20,986.80, 31,516.65 and 11,145.30

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Solution

The fourth proportional to 20,986.80, 31,516.65 and 11,145.30 is: 16,737.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.80 : 31,516.65 = 11,145.30 : x
  2. Step 2: Convert to fraction form
    20,986.80/31,516.65 = 11,145.30/x
  3. Step 3: Cross multiply
    20,986.80x = 31,516.65 × 11,145.30
  4. Step 4: Simplify right side
    20,986.80x = 351,262,519.25
  5. Step 5: Solve for x
    x = 351,262,519.25/20,986.80
  6. Step 6: Final answer
    x = 16,737.31

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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.