Home / 21,121.90-29,151.30-12,167.68

Finding the Fourth Proportional to 21,121.90, 29,151.30 and 12,167.68

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Solution

The fourth proportional to 21,121.90, 29,151.30 and 12,167.68 is: 16,793.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.90 : 29,151.30 = 12,167.68 : x
  2. Step 2: Convert to fraction form
    21,121.90/29,151.30 = 12,167.68/x
  3. Step 3: Cross multiply
    21,121.90x = 29,151.30 × 12,167.68
  4. Step 4: Simplify right side
    21,121.90x = 354,703,689.98
  5. Step 5: Solve for x
    x = 354,703,689.98/21,121.90
  6. Step 6: Final answer
    x = 16,793.17

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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.