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Finding the Fourth Proportional to 21,681.68, 29,920.52 and 11,745.68

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Solution

The fourth proportional to 21,681.68, 29,920.52 and 11,745.68 is: 16,208.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.68 : 29,920.52 = 11,745.68 : x
  2. Step 2: Convert to fraction form
    21,681.68/29,920.52 = 11,745.68/x
  3. Step 3: Cross multiply
    21,681.68x = 29,920.52 × 11,745.68
  4. Step 4: Simplify right side
    21,681.68x = 351,436,853.35
  5. Step 5: Solve for x
    x = 351,436,853.35/21,681.68
  6. Step 6: Final answer
    x = 16,208.93

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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.