Home / 21,277.30-31,918.14-8,140.72

Finding the Fourth Proportional to 21,277.30, 31,918.14 and 8,140.72

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Solution

The fourth proportional to 21,277.30, 31,918.14 and 8,140.72 is: 12,211.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,277.30 : 31,918.14 = 8,140.72 : x
  2. Step 2: Convert to fraction form
    21,277.30/31,918.14 = 8,140.72/x
  3. Step 3: Cross multiply
    21,277.30x = 31,918.14 × 8,140.72
  4. Step 4: Simplify right side
    21,277.30x = 259,836,640.66
  5. Step 5: Solve for x
    x = 259,836,640.66/21,277.30
  6. Step 6: Final answer
    x = 12,211.92

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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.