Home / 21,218.82-31,828.32-7,178.96

Finding the Fourth Proportional to 21,218.82, 31,828.32 and 7,178.96

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Solution

The fourth proportional to 21,218.82, 31,828.32 and 7,178.96 is: 10,768.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.82 : 31,828.32 = 7,178.96 : x
  2. Step 2: Convert to fraction form
    21,218.82/31,828.32 = 7,178.96/x
  3. Step 3: Cross multiply
    21,218.82x = 31,828.32 × 7,178.96
  4. Step 4: Simplify right side
    21,218.82x = 228,494,236.15
  5. Step 5: Solve for x
    x = 228,494,236.15/21,218.82
  6. Step 6: Final answer
    x = 10,768.47

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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.