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Finding the Fourth Proportional to 21,920.72, 32,872.98 and 7,876.97

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Solution

The fourth proportional to 21,920.72, 32,872.98 and 7,876.97 is: 11,812.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.72 : 32,872.98 = 7,876.97 : x
  2. Step 2: Convert to fraction form
    21,920.72/32,872.98 = 7,876.97/x
  3. Step 3: Cross multiply
    21,920.72x = 32,872.98 × 7,876.97
  4. Step 4: Simplify right side
    21,920.72x = 258,939,312.91
  5. Step 5: Solve for x
    x = 258,939,312.91/21,920.72
  6. Step 6: Final answer
    x = 11,812.54

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1.5x scale

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.