Home / 20,870.38-28,800.66-11,917.90

Finding the Fourth Proportional to 20,870.38, 28,800.66 and 11,917.90

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Solution

The fourth proportional to 20,870.38, 28,800.66 and 11,917.90 is: 16,446.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.38 : 28,800.66 = 11,917.90 : x
  2. Step 2: Convert to fraction form
    20,870.38/28,800.66 = 11,917.90/x
  3. Step 3: Cross multiply
    20,870.38x = 28,800.66 × 11,917.90
  4. Step 4: Simplify right side
    20,870.38x = 343,243,385.81
  5. Step 5: Solve for x
    x = 343,243,385.81/20,870.38
  6. Step 6: Final answer
    x = 16,446.44

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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.