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Finding the Fourth Proportional to 66,135.88, 99,215.97 and 21,765.30

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Solution

The fourth proportional to 66,135.88, 99,215.97 and 21,765.30 is: 32,651.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,135.88 : 99,215.97 = 21,765.30 : x
  2. Step 2: Convert to fraction form
    66,135.88/99,215.97 = 21,765.30/x
  3. Step 3: Cross multiply
    66,135.88x = 99,215.97 × 21,765.30
  4. Step 4: Simplify right side
    66,135.88x = 2,159,465,351.84
  5. Step 5: Solve for x
    x = 2,159,465,351.84/66,135.88
  6. Step 6: Final answer
    x = 32,651.95

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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.