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Finding the Fourth Proportional to 21,681.56, 29,920.56 and 11,745.56

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Solution

The fourth proportional to 21,681.56, 29,920.56 and 11,745.56 is: 16,208.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.56 : 29,920.56 = 11,745.56 : x
  2. Step 2: Convert to fraction form
    21,681.56/29,920.56 = 11,745.56/x
  3. Step 3: Cross multiply
    21,681.56x = 29,920.56 × 11,745.56
  4. Step 4: Simplify right side
    21,681.56x = 351,433,732.71
  5. Step 5: Solve for x
    x = 351,433,732.71/21,681.56
  6. Step 6: Final answer
    x = 16,208.88

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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.