Home / 21,920.13-32,872.12-7,876.40

Finding the Fourth Proportional to 21,920.13, 32,872.12 and 7,876.40

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Solution

The fourth proportional to 21,920.13, 32,872.12 and 7,876.40 is: 11,811.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.13 : 32,872.12 = 7,876.40 : x
  2. Step 2: Convert to fraction form
    21,920.13/32,872.12 = 7,876.40/x
  3. Step 3: Cross multiply
    21,920.13x = 32,872.12 × 7,876.40
  4. Step 4: Simplify right side
    21,920.13x = 258,914,028.46
  5. Step 5: Solve for x
    x = 258,914,028.46/21,920.13
  6. Step 6: Final answer
    x = 11,811.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.