Home / 20,890.60-31,318.34-9,791.44

Finding the Fourth Proportional to 20,890.60, 31,318.34 and 9,791.44

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Solution

The fourth proportional to 20,890.60, 31,318.34 and 9,791.44 is: 14,678.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.60 : 31,318.34 = 9,791.44 : x
  2. Step 2: Convert to fraction form
    20,890.60/31,318.34 = 9,791.44/x
  3. Step 3: Cross multiply
    20,890.60x = 31,318.34 × 9,791.44
  4. Step 4: Simplify right side
    20,890.60x = 306,651,647.01
  5. Step 5: Solve for x
    x = 306,651,647.01/20,890.60
  6. Step 6: Final answer
    x = 14,678.93

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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.