Home / 20,991.12-31,493.97-9,312.54

Finding the Fourth Proportional to 20,991.12, 31,493.97 and 9,312.54

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Solution

The fourth proportional to 20,991.12, 31,493.97 and 9,312.54 is: 13,972.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.12 : 31,493.97 = 9,312.54 : x
  2. Step 2: Convert to fraction form
    20,991.12/31,493.97 = 9,312.54/x
  3. Step 3: Cross multiply
    20,991.12x = 31,493.97 × 9,312.54
  4. Step 4: Simplify right side
    20,991.12x = 293,288,855.38
  5. Step 5: Solve for x
    x = 293,288,855.38/20,991.12
  6. Step 6: Final answer
    x = 13,972.04

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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.