Home / 20,721.38-31,045.21-11,938.14

Finding the Fourth Proportional to 20,721.38, 31,045.21 and 11,938.14

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Solution

The fourth proportional to 20,721.38, 31,045.21 and 11,938.14 is: 17,885.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.38 : 31,045.21 = 11,938.14 : x
  2. Step 2: Convert to fraction form
    20,721.38/31,045.21 = 11,938.14/x
  3. Step 3: Cross multiply
    20,721.38x = 31,045.21 × 11,938.14
  4. Step 4: Simplify right side
    20,721.38x = 370,622,033.46
  5. Step 5: Solve for x
    x = 370,622,033.46/20,721.38
  6. Step 6: Final answer
    x = 17,885.98

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1.5x scale

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.