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Finding the Fourth Proportional to 21,681.34, 29,920.24 and 11,745.34

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Solution

The fourth proportional to 21,681.34, 29,920.24 and 11,745.34 is: 16,208.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.34 : 29,920.24 = 11,745.34 : x
  2. Step 2: Convert to fraction form
    21,681.34/29,920.24 = 11,745.34/x
  3. Step 3: Cross multiply
    21,681.34x = 29,920.24 × 11,745.34
  4. Step 4: Simplify right side
    21,681.34x = 351,423,391.68
  5. Step 5: Solve for x
    x = 351,423,391.68/21,681.34
  6. Step 6: Final answer
    x = 16,208.56

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1.5x scale

Why These Related Problems?

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