Home / 20,835.64-31,231.56-7,679.60

Finding the Fourth Proportional to 20,835.64, 31,231.56 and 7,679.60

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Solution

The fourth proportional to 20,835.64, 31,231.56 and 7,679.60 is: 11,511.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,835.64 : 31,231.56 = 7,679.60 : x
  2. Step 2: Convert to fraction form
    20,835.64/31,231.56 = 7,679.60/x
  3. Step 3: Cross multiply
    20,835.64x = 31,231.56 × 7,679.60
  4. Step 4: Simplify right side
    20,835.64x = 239,845,888.18
  5. Step 5: Solve for x
    x = 239,845,888.18/20,835.64
  6. Step 6: Final answer
    x = 11,511.33

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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.