Home / 20,905.70-31,356.25-6,114.75

Finding the Fourth Proportional to 20,905.70, 31,356.25 and 6,114.75

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Solution

The fourth proportional to 20,905.70, 31,356.25 and 6,114.75 is: 9,171.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.70 : 31,356.25 = 6,114.75 : x
  2. Step 2: Convert to fraction form
    20,905.70/31,356.25 = 6,114.75/x
  3. Step 3: Cross multiply
    20,905.70x = 31,356.25 × 6,114.75
  4. Step 4: Simplify right side
    20,905.70x = 191,735,629.69
  5. Step 5: Solve for x
    x = 191,735,629.69/20,905.70
  6. Step 6: Final answer
    x = 9,171.45

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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.