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Finding the Fourth Proportional to 21,681.84, 29,920.84 and 11,745.84

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Solution

The fourth proportional to 21,681.84, 29,920.84 and 11,745.84 is: 16,209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.84 : 29,920.84 = 11,745.84 : x
  2. Step 2: Convert to fraction form
    21,681.84/29,920.84 = 11,745.84/x
  3. Step 3: Cross multiply
    21,681.84x = 29,920.84 × 11,745.84
  4. Step 4: Simplify right side
    21,681.84x = 351,445,399.31
  5. Step 5: Solve for x
    x = 351,445,399.31/21,681.84
  6. Step 6: Final answer
    x = 16,209.21

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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.