Home / 20,917.62-31,386.69-9,216.90

Finding the Fourth Proportional to 20,917.62, 31,386.69 and 9,216.90

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Solution

The fourth proportional to 20,917.62, 31,386.69 and 9,216.90 is: 13,829.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.62 : 31,386.69 = 9,216.90 : x
  2. Step 2: Convert to fraction form
    20,917.62/31,386.69 = 9,216.90/x
  3. Step 3: Cross multiply
    20,917.62x = 31,386.69 × 9,216.90
  4. Step 4: Simplify right side
    20,917.62x = 289,287,983.06
  5. Step 5: Solve for x
    x = 289,287,983.06/20,917.62
  6. Step 6: Final answer
    x = 13,829.87

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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.