Home / 21,270.97-31,871.35-12,361.29

Finding the Fourth Proportional to 21,270.97, 31,871.35 and 12,361.29

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Solution

The fourth proportional to 21,270.97, 31,871.35 and 12,361.29 is: 18,521.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.97 : 31,871.35 = 12,361.29 : x
  2. Step 2: Convert to fraction form
    21,270.97/31,871.35 = 12,361.29/x
  3. Step 3: Cross multiply
    21,270.97x = 31,871.35 × 12,361.29
  4. Step 4: Simplify right side
    21,270.97x = 393,971,000.04
  5. Step 5: Solve for x
    x = 393,971,000.04/21,270.97
  6. Step 6: Final answer
    x = 18,521.53

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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.