Home / 21,910.12-30,243.78-12,960.76

Finding the Fourth Proportional to 21,910.12, 30,243.78 and 12,960.76

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Solution

The fourth proportional to 21,910.12, 30,243.78 and 12,960.76 is: 17,890.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,910.12 : 30,243.78 = 12,960.76 : x
  2. Step 2: Convert to fraction form
    21,910.12/30,243.78 = 12,960.76/x
  3. Step 3: Cross multiply
    21,910.12x = 30,243.78 × 12,960.76
  4. Step 4: Simplify right side
    21,910.12x = 391,982,374.07
  5. Step 5: Solve for x
    x = 391,982,374.07/21,910.12
  6. Step 6: Final answer
    x = 17,890.47

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.