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Finding the Fourth Proportional to 21,921.84, 32,871.22 and 7,128.91

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Solution

The fourth proportional to 21,921.84, 32,871.22 and 7,128.91 is: 10,689.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,921.84 : 32,871.22 = 7,128.91 : x
  2. Step 2: Convert to fraction form
    21,921.84/32,871.22 = 7,128.91/x
  3. Step 3: Cross multiply
    21,921.84x = 32,871.22 × 7,128.91
  4. Step 4: Simplify right side
    21,921.84x = 234,335,992.24
  5. Step 5: Solve for x
    x = 234,335,992.24/21,921.84
  6. Step 6: Final answer
    x = 10,689.61

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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.