Home / 20,821.42-31,182.08-11,909.73

Finding the Fourth Proportional to 20,821.42, 31,182.08 and 11,909.73

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Solution

The fourth proportional to 20,821.42, 31,182.08 and 11,909.73 is: 17,835.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.42 : 31,182.08 = 11,909.73 : x
  2. Step 2: Convert to fraction form
    20,821.42/31,182.08 = 11,909.73/x
  3. Step 3: Cross multiply
    20,821.42x = 31,182.08 × 11,909.73
  4. Step 4: Simplify right side
    20,821.42x = 371,369,938.18
  5. Step 5: Solve for x
    x = 371,369,938.18/20,821.42
  6. Step 6: Final answer
    x = 17,835.96

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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.