Home / 81,135.52-121,710.96-31,876

Finding the Fourth Proportional to 81,135.52, 121,710.96 and 31,876

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Solution

The fourth proportional to 81,135.52, 121,710.96 and 31,876 is: 47,817.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,135.52 : 121,710.96 = 31,876 : x
  2. Step 2: Convert to fraction form
    81,135.52/121,710.96 = 31,876/x
  3. Step 3: Cross multiply
    81,135.52x = 121,710.96 × 31,876
  4. Step 4: Simplify right side
    81,135.52x = 3,879,658,560.96
  5. Step 5: Solve for x
    x = 3,879,658,560.96/81,135.52
  6. Step 6: Final answer
    x = 47,817.02

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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.