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Finding the Fourth Proportional to 21,684.15, 29,915.06 and 16,895.78

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Solution

The fourth proportional to 21,684.15, 29,915.06 and 16,895.78 is: 23,309.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,684.15 : 29,915.06 = 16,895.78 : x
  2. Step 2: Convert to fraction form
    21,684.15/29,915.06 = 16,895.78/x
  3. Step 3: Cross multiply
    21,684.15x = 29,915.06 × 16,895.78
  4. Step 4: Simplify right side
    21,684.15x = 505,438,197.66
  5. Step 5: Solve for x
    x = 505,438,197.66/21,684.15
  6. Step 6: Final answer
    x = 23,309.11

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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.