Home / 20,811.54-31,214.25-7,660.86

Finding the Fourth Proportional to 20,811.54, 31,214.25 and 7,660.86

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Solution

The fourth proportional to 20,811.54, 31,214.25 and 7,660.86 is: 11,490.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.54 : 31,214.25 = 7,660.86 : x
  2. Step 2: Convert to fraction form
    20,811.54/31,214.25 = 7,660.86/x
  3. Step 3: Cross multiply
    20,811.54x = 31,214.25 × 7,660.86
  4. Step 4: Simplify right side
    20,811.54x = 239,127,999.26
  5. Step 5: Solve for x
    x = 239,127,999.26/20,811.54
  6. Step 6: Final answer
    x = 11,490.16

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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.