Home / 21,165.54-31,768.84-11,311.76

Finding the Fourth Proportional to 21,165.54, 31,768.84 and 11,311.76

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Solution

The fourth proportional to 21,165.54, 31,768.84 and 11,311.76 is: 16,978.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,165.54 : 31,768.84 = 11,311.76 : x
  2. Step 2: Convert to fraction form
    21,165.54/31,768.84 = 11,311.76/x
  3. Step 3: Cross multiply
    21,165.54x = 31,768.84 × 11,311.76
  4. Step 4: Simplify right side
    21,165.54x = 359,361,493.56
  5. Step 5: Solve for x
    x = 359,361,493.56/21,165.54
  6. Step 6: Final answer
    x = 16,978.61

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1.5x scale

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.