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Finding the Fourth Proportional to 21,858.80, 32,821.20 and 17,463.20

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Solution

The fourth proportional to 21,858.80, 32,821.20 and 17,463.20 is: 26,221.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.80 : 32,821.20 = 17,463.20 : x
  2. Step 2: Convert to fraction form
    21,858.80/32,821.20 = 17,463.20/x
  3. Step 3: Cross multiply
    21,858.80x = 32,821.20 × 17,463.20
  4. Step 4: Simplify right side
    21,858.80x = 573,163,179.84
  5. Step 5: Solve for x
    x = 573,163,179.84/21,858.80
  6. Step 6: Final answer
    x = 26,221.16

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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.