Home / 20,942.10-28,899.90-11,991.18

Finding the Fourth Proportional to 20,942.10, 28,899.90 and 11,991.18

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Solution

The fourth proportional to 20,942.10, 28,899.90 and 11,991.18 is: 16,547.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.10 : 28,899.90 = 11,991.18 : x
  2. Step 2: Convert to fraction form
    20,942.10/28,899.90 = 11,991.18/x
  3. Step 3: Cross multiply
    20,942.10x = 28,899.90 × 11,991.18
  4. Step 4: Simplify right side
    20,942.10x = 346,543,902.88
  5. Step 5: Solve for x
    x = 346,543,902.88/20,942.10
  6. Step 6: Final answer
    x = 16,547.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.