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Finding the Fourth Proportional to 21,765.88, 32,692.58 and 19,021.20

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Solution

The fourth proportional to 21,765.88, 32,692.58 and 19,021.20 is: 28,570.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,765.88 : 32,692.58 = 19,021.20 : x
  2. Step 2: Convert to fraction form
    21,765.88/32,692.58 = 19,021.20/x
  3. Step 3: Cross multiply
    21,765.88x = 32,692.58 × 19,021.20
  4. Step 4: Simplify right side
    21,765.88x = 621,852,102.70
  5. Step 5: Solve for x
    x = 621,852,102.70/21,765.88
  6. Step 6: Final answer
    x = 28,570.04

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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.