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Finding the Fourth Proportional to 21,167.80, 29,218.02 and 12,221.14

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Solution

The fourth proportional to 21,167.80, 29,218.02 and 12,221.14 is: 16,868.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.80 : 29,218.02 = 12,221.14 : x
  2. Step 2: Convert to fraction form
    21,167.80/29,218.02 = 12,221.14/x
  3. Step 3: Cross multiply
    21,167.80x = 29,218.02 × 12,221.14
  4. Step 4: Simplify right side
    21,167.80x = 357,077,512.94
  5. Step 5: Solve for x
    x = 357,077,512.94/21,167.80
  6. Step 6: Final answer
    x = 16,868.90

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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.