Home / 20,922.18-28,872.29-11,971.89

Finding the Fourth Proportional to 20,922.18, 28,872.29 and 11,971.89

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Solution

The fourth proportional to 20,922.18, 28,872.29 and 11,971.89 is: 16,521.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,922.18 : 28,872.29 = 11,971.89 : x
  2. Step 2: Convert to fraction form
    20,922.18/28,872.29 = 11,971.89/x
  3. Step 3: Cross multiply
    20,922.18x = 28,872.29 × 11,971.89
  4. Step 4: Simplify right side
    20,922.18x = 345,655,820.07
  5. Step 5: Solve for x
    x = 345,655,820.07/20,922.18
  6. Step 6: Final answer
    x = 16,521.02

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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.