Home / 20,911.72-31,368.54-6,121.92

Finding the Fourth Proportional to 20,911.72, 31,368.54 and 6,121.92

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Solution

The fourth proportional to 20,911.72, 31,368.54 and 6,121.92 is: 9,183.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.72 : 31,368.54 = 6,121.92 : x
  2. Step 2: Convert to fraction form
    20,911.72/31,368.54 = 6,121.92/x
  3. Step 3: Cross multiply
    20,911.72x = 31,368.54 × 6,121.92
  4. Step 4: Simplify right side
    20,911.72x = 192,035,692.40
  5. Step 5: Solve for x
    x = 192,035,692.40/20,911.72
  6. Step 6: Final answer
    x = 9,183.16

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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.