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Finding the Fourth Proportional to 21,696.88, 29,939.20 and 12,265.40

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Solution

The fourth proportional to 21,696.88, 29,939.20 and 12,265.40 is: 16,924.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,696.88 : 29,939.20 = 12,265.40 : x
  2. Step 2: Convert to fraction form
    21,696.88/29,939.20 = 12,265.40/x
  3. Step 3: Cross multiply
    21,696.88x = 29,939.20 × 12,265.40
  4. Step 4: Simplify right side
    21,696.88x = 367,216,263.68
  5. Step 5: Solve for x
    x = 367,216,263.68/21,696.88
  6. Step 6: Final answer
    x = 16,924.84

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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.