Home / 21,281.88-31,935.54-8,135.28

Finding the Fourth Proportional to 21,281.88, 31,935.54 and 8,135.28

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Solution

The fourth proportional to 21,281.88, 31,935.54 and 8,135.28 is: 12,207.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,281.88 : 31,935.54 = 8,135.28 : x
  2. Step 2: Convert to fraction form
    21,281.88/31,935.54 = 8,135.28/x
  3. Step 3: Cross multiply
    21,281.88x = 31,935.54 × 8,135.28
  4. Step 4: Simplify right side
    21,281.88x = 259,804,559.85
  5. Step 5: Solve for x
    x = 259,804,559.85/21,281.88
  6. Step 6: Final answer
    x = 12,207.78

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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.