Home / 21,228.88-31,690.52-19,690.96

Finding the Fourth Proportional to 21,228.88, 31,690.52 and 19,690.96

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Solution

The fourth proportional to 21,228.88, 31,690.52 and 19,690.96 is: 29,394.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,228.88 : 31,690.52 = 19,690.96 : x
  2. Step 2: Convert to fraction form
    21,228.88/31,690.52 = 19,690.96/x
  3. Step 3: Cross multiply
    21,228.88x = 31,690.52 × 19,690.96
  4. Step 4: Simplify right side
    21,228.88x = 624,016,761.70
  5. Step 5: Solve for x
    x = 624,016,761.70/21,228.88
  6. Step 6: Final answer
    x = 29,394.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.